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 A157468 #30 Sep 28 2018 10:15:34 %S A157468 3,5,13,19,23,53,73,83,89,109,149,179,223,229,239,263,269,283,313,349, %T A157468 383,419,439,443,463,569,593,643,653,673,739,859,863,919,929,1009, %U A157468 1069,1093,1123,1289,1319,1373,1409,1429,1433,1439,1459 %N A157468 Primes of the form sqrt(p-1)-1, where p is a prime. %H A157468 Alois P. Heinz, <a href="/A157468/b157468.txt">Table of n, a(n) for n = 1..10000</a> %e A157468 3 is in the sequence because 3 = sqrt(17 - 1) - 1, where 17 is prime. %e A157468 5 is in the sequence because 5 = sqrt(37 - 1) - 1, where 37 is prime. %t A157468 Select[Sqrt[#-1]-1&/@Prime[Range[200000]],PrimeQ] (* _Harvey P. Dale_, May 19 2012 *) %Y A157468 Cf. A070155, A127435, A127436, A157467. %Y A157468 Column k=1 of A238048 and A238086. %K A157468 nonn %O A157468 1,1 %A A157468 _Vladimir Joseph Stephan Orlovsky_, Mar 01 2009