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 A061411 #10 Nov 09 2019 03:14:52 %S A061411 1,22,24,65,110,112,135,137,166,167,218,219,220,228,229,239,257,280, %T A061411 310,344,345,346,398,399,403,404,405,430,439,440,475,494,504,505,508, %U A061411 522,524,534,535,536,557,559,592,619,620,624,625,626,679,703,705,706 %N A061411 Numbers k such that m*2^k - 1 is nonprime for all coefficients m in the range 0 <= m <= k. %Y A061411 Cf. A061410, A061412, A061413, A061414, A061415. %K A061411 nonn %O A061411 1,2 %A A061411 _Patrick De Geest_, May 15 2001 %E A061411 Name edited and Offset changed by _Jon E. Schoenfield_, Oct 26 2019