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A Danish Social security number consists of two numbers - the first one being four arbitrary digits, and the second one being the six digits of your birthday.

by mixmax 17y ago

A Danish Social security number consists of two numbers - the first one being four arbitrary digits, and the second one being the six digits of your birthday. My two numbers aren't only prime, which in and of itself would be pretty unlikely. No they're Twin primes. (http://en.wikipedia.org/wiki/Twin_prime http://en.wikipedia.org/wiki/Twin_prime) This is the only place I know where information like that would be considered pretty cool :-) Now somebody guess my birthday.

yan 17y ago
Now someone can guess your entire social security number :P
- mixmax 17y ago
  Calculated risk
pvg 17y ago
Which two numbers? It's quite difficult for a six digit and four digit number to be twin primes. Some zany Danish date format?
swolchok 17y ago
Impossible? Danes write dates as dd-mm-yy according to http://en.wikipedia.org/wiki/Calendar_date http://en.wikipedia.org/wiki/Calendar_date, so your birthday can have at most one leading zero and thus is >= 10100. 9973 is the largest 4-digit prime number, and 9973 + 2 is 1) not prime and 2) not a 5-digit number.
- mixmax 17y ago
  We're talking about two sets of twin primes, each part of the social security number being in each set. I'm sorry I didn't make it clear in the OP.
niyazpk 17y ago
Assuming that (1) you were born between 1950 and 1985 and (2) the danish date format is (dd-mm-yy), here are the possible DOBs: 10-01-51 30-01-51 17-03-51 14-05-51 26-05-51 27-05-51 13-06-51 16-06-51 16-07-51 18-07-51 25-07-51 25-09-51 15-10-51 21-10-51 24-10-51 21-11-51 13-12-51 17-12-51 19-12-51 28-12-51 10-01-53 17-03-53 27-05-53 16-07-53 25-07-53 21-11-53 17-12-53 24-02-57 29-06-57 25-10-57 13-02-59 24-02-59 21-03-59 29-06-59 14-07-59 17-07-59 22-08-59 15-09-59 25-10-59 26-10-59 10-11-59 24-12-59 13-02-61 10-03-61 21-03-61 31-03-61 27-04-61 23-05-61 14-07-61 17-07-61 27-07-61 22-08-61 23-08-61 26-08-61 15-09-61 12-10-61 18-10-61 21-10-61 26-10-61 10-11-61 17-11-61 24-12-61 25-12-61 10-03-63 31-03-63 27-04-63 23-05-63 27-07-63 23-08-63 26-08-63 12-10-63 18-10-63 21-10-63 17-11-63 25-12-63 13-03-67 19-03-67 11-05-67 19-06-67 15-07-67 14-08-67 20-08-67 16-09-67 25-09-67 24-10-67 17-11-67 26-11-67 29-11-67 27-02-69 13-03-69 17-03-69 19-03-69 22-04-69 11-05-69 19-06-69 29-06-69 15-07-69 28-07-69 14-08-69 20-08-69 16-09-69 25-09-69 22-10-69 24-10-69 12-11-69 15-11-69 17-11-69 26-11-69 29-11-69 11-12-69 23-12-69 27-02-71 17-03-71 22-04-71 29-04-71 29-06-71 23-07-71 28-07-71 22-10-71 12-11-71 15-11-71 22-11-71 11-12-71 23-12-71 29-04-73 23-07-73 22-11-73 15-03-77 11-04-77 19-05-77 16-08-77 22-08-77 17-10-77 25-11-77 27-12-77 18-01-79 15-03-79 11-04-79 19-05-79 11-08-79 16-08-79 22-08-79 17-10-79 14-11-79 25-11-79 10-12-79 27-12-79 18-01-81 20-03-81 16-04-81 30-05-81 14-06-81 11-08-81 15-08-81 24-08-81 14-11-81 30-11-81 10-12-81 20-03-83 16-04-83 30-05-83 14-06-83 15-08-83 24-08-83 30-11-83
- smokinn 17y ago
  Thanks for the list but he said 6 digits... So the format is probably dd-mm-yy.
  - niyazpk 17y ago
    Oops! Corrected.
pvg 17y ago
Assuming you're talking about splitting your SSN down the middle (two 5 digit numbers) and it looks something like this http://en.wikipedia.org/wiki/Personal_identification_number_%28Denmark%29 http://en.wikipedia.org/wiki/Personal_identification_number_... The candidates are (unless I horked something up, these are pairs of 5 digit twin primes that start with a sensible 6 digit date and checksum as Danish SSNs) 0212702129 0608706089 2105721059 2210722109 That's assuming you were not born in '90 or '91.

by mixmax 17y ago

yan 17y ago

Now someone can guess your entire social security number :P

mixmax 17y ago
Calculated risk

pvg 17y ago

Which two numbers? It's quite difficult for a six digit and four digit number to be twin primes. Some zany Danish date format?

swolchok 17y ago

Impossible? Danes write dates as dd-mm-yy according to http://en.wikipedia.org/wiki/Calendar_date http://en.wikipedia.org/wiki/Calendar_date, so your birthday can have at most one leading zero and thus is >= 10100. 9973 is the largest 4-digit prime number, and 9973 + 2 is 1) not prime and 2) not a 5-digit number.

mixmax 17y ago
We're talking about two sets of twin primes, each part of the social security number being in each set. I'm sorry I didn't make it clear in the OP.

niyazpk 17y ago

Assuming that (1) you were born between 1950 and 1985 and (2) the danish date format is (dd-mm-yy), here are the possible DOBs: 10-01-51 30-01-51 17-03-51 14-05-51 26-05-51 27-05-51 13-06-51 16-06-51 16-07-51 18-07-51 25-07-51 25-09-51 15-10-51 21-10-51 24-10-51 21-11-51 13-12-51 17-12-51 19-12-51 28-12-51 10-01-53 17-03-53 27-05-53 16-07-53 25-07-53 21-11-53 17-12-53 24-02-57 29-06-57 25-10-57 13-02-59 24-02-59 21-03-59 29-06-59 14-07-59 17-07-59 22-08-59 15-09-59 25-10-59 26-10-59 10-11-59 24-12-59 13-02-61 10-03-61 21-03-61 31-03-61 27-04-61 23-05-61 14-07-61 17-07-61 27-07-61 22-08-61 23-08-61 26-08-61 15-09-61 12-10-61 18-10-61 21-10-61 26-10-61 10-11-61 17-11-61 24-12-61 25-12-61 10-03-63 31-03-63 27-04-63 23-05-63 27-07-63 23-08-63 26-08-63 12-10-63 18-10-63 21-10-63 17-11-63 25-12-63 13-03-67 19-03-67 11-05-67 19-06-67 15-07-67 14-08-67 20-08-67 16-09-67 25-09-67 24-10-67 17-11-67 26-11-67 29-11-67 27-02-69 13-03-69 17-03-69 19-03-69 22-04-69 11-05-69 19-06-69 29-06-69 15-07-69 28-07-69 14-08-69 20-08-69 16-09-69 25-09-69 22-10-69 24-10-69 12-11-69 15-11-69 17-11-69 26-11-69 29-11-69 11-12-69 23-12-69 27-02-71 17-03-71 22-04-71 29-04-71 29-06-71 23-07-71 28-07-71 22-10-71 12-11-71 15-11-71 22-11-71 11-12-71 23-12-71 29-04-73 23-07-73 22-11-73 15-03-77 11-04-77 19-05-77 16-08-77 22-08-77 17-10-77 25-11-77 27-12-77 18-01-79 15-03-79 11-04-79 19-05-79 11-08-79 16-08-79 22-08-79 17-10-79 14-11-79 25-11-79 10-12-79 27-12-79 18-01-81 20-03-81 16-04-81 30-05-81 14-06-81 11-08-81 15-08-81 24-08-81 14-11-81 30-11-81 10-12-81 20-03-83 16-04-83 30-05-83 14-06-83 15-08-83 24-08-83 30-11-83

smokinn 17y ago
Thanks for the list but he said 6 digits... So the format is probably dd-mm-yy.
- niyazpk 17y ago
  Oops! Corrected.

pvg 17y ago

Assuming you're talking about splitting your SSN down the middle (two 5 digit numbers) and it looks something like this http://en.wikipedia.org/wiki/Personal_identification_number_%28Denmark%29 http://en.wikipedia.org/wiki/Personal_identification_number_... The candidates are (unless I horked something up, these are pairs of 5 digit twin primes that start with a sensible 6 digit date and checksum as Danish SSNs) 0212702129 0608706089 2105721059 2210722109 That's assuming you were not born in '90 or '91.