This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A230485 #9 Dec 08 2016 20:20:53 %S A230485 3465253618401,44202753561285411,1640293473202755801, %T A230485 10623546148468360251 %N A230485 Strong pseudoprimes n to base 2 such that n-2 and n+2 are primes. %C A230485 For all n, a(n)-2 is in A230810. - _M. F. Hasler_, Dec 08 2016 %e A230485 3465253618401 is a strong pseudoprime (base 2) and 3465253618399 and 3465253618403 are primes. %Y A230485 Cf. A001567, A057942, A001262, A230483, A230484. %K A230485 nonn,more,hard %O A230485 1,1 %A A230485 _Shyam Sunder Gupta_, Oct 20 2013