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 A077500 #14 May 15 2020 06:42:57 %S A077500 2,3,5,7,11,13,17,19,23,29,37,41,47,53,59,73,83,89,97,101,107,109,113, %T A077500 137,149,163,167,173,179,193,197,227,233,251,257,263,269,293,317,347, %U A077500 353,359,383,389,401,433,449,467,479,487,503,509,557,563,569,577,587 %N A077500 Primes of the form 2^r*p^s + 1, where p is an odd prime. %C A077500 Primes p such that p-1 has at most one odd prime divisor. %H A077500 Amiram Eldar, <a href="/A077500/b077500.txt">Table of n, a(n) for n = 1..10000</a> %t A077500 Select[Prime[Range[110]],Length[Select[FactorInteger[#-1] [[All, 1]], OddQ]]<2&] (* _Harvey P. Dale_, Oct 09 2017 *) %Y A077500 Cf. A005109, A077497, A077498, A077499. %K A077500 nonn %O A077500 1,1 %A A077500 _Amarnath Murthy_, Nov 07 2002 %E A077500 Corrected and extended by _Sascha Kurz_, Jan 04 2003