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 A061412 #9 Nov 09 2019 03:14:40 %S A061412 1,2,3,4,5,18,21,23,24,26,30,32,34,35,56,57,58,59,69,70,71,87,95,96, %T A061412 97,106,107,108,109,112,116,120,121,131,137,139,140,142,150,151,156, %U A061412 159,161,163,171,172,176,177,178,181,191,192,194,195,196,197,212,219,220 %N A061412 Numbers k such that m*2^k + 1 is prime for exactly one coefficient m in the range 0 <= m <= k. %C A061412 For corresponding coefficient values see A061413. %Y A061412 Cf. A061410, A061411, A061413, A061414, A061415. %K A061412 nonn %O A061412 1,2 %A A061412 _Patrick De Geest_, May 15 2001 %E A061412 Name edited and Offset changed by _Jon E. Schoenfield_, Oct 26 2019