Re:This PIN can be easily guessed
by jerf on Friday March 13, 2020 @02:33PM
(#22569721)
I hypothesize without proof that if you enter "A, B, C, D" for any single-digit A, B, C, and D into http://oeis.org/ that you will find some reason why that is not a valid PIN.
7397: Digits 4-8 of the sequence "sum of iterated phi(n)".
1074: Sorry, that's digits 4-8 of log_21(8). Please try again.
6235: Sorry, that's digits 10-14 of an irregular triangle read by row's squarefree quadratic non-residues. Please try again.
2099: Sorry, that's digits 4-8 of the decimal expansion of the x-intercept of the shortest segment from the positive x axis through (2,1) to the line y=x.
Clearly, these are all way too easy to guess for an attacker for you to use them as a PIN number.
7397: Digits 4-8 of the sequence "sum of iterated phi(n)".
1074: Sorry, that's digits 4-8 of log_21(8). Please try again.
6235: Sorry, that's digits 10-14 of an irregular triangle read by row's squarefree quadratic non-residues. Please try again.
2099: Sorry, that's digits 4-8 of the decimal expansion of the x-intercept of the shortest segment from the positive x axis through (2,1) to the line y=x.
Clearly, these are all way too easy to guess for an attacker for you to use them as a PIN number.