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 A112451 #6 Nov 10 2019 13:56:24 %S A112451 800605,4502485,5310721,7177105,9995671,10655905,11473885,13216141, %T A112451 15698431,21417991,22564081,29878381,36338653,38624041,43397551, %U A112451 45485881,45769645,48369727,51340807,57561085,77576401,81445585,86067241,90626185,104852881,112792519,115007581 %N A112451 Strong pseudoprimes (base-2) equal to product of 4 primes not necessarily distinct. %H A112451 Amiram Eldar, <a href="/A112451/b112451.txt">Table of n, a(n) for n = 1..10000</a> %e A112451 a(1) = 800605 = 5*13*109*113. %Y A112451 Intersection of A014613 and A001262. %K A112451 nonn %O A112451 1,1 %A A112451 _Shyam Sunder Gupta_, Dec 12 2005 %E A112451 More terms from _Amiram Eldar_, Nov 10 2019