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 A349864 #11 May 06 2022 13:13:51 %S A349864 1,2,3,4,5,6,7,8,9,32,0,13,0,52,23,62,0,33,0,14,43,92,0,24,0,0,63,34, %T A349864 0,15,0,44,83,0,25,54,0,0,0,35,0,16,0,74,45,0,0,26,0,55,0,94,0,36,65, %U A349864 17,0,0,0,46,0,0,27,422,85,56,0,0,0,37,0,18,0,0,0,0,47,76,0,28,603,0,0,57,0,0,0,38,0,19 %N A349864 Smallest k such that A349278(k) = n, or 0 if no such k exists. %C A349864 Composite numbers m for which a(m) = 0 are in A349865. %F A349864 If p prime >= 11, a(p) = 0. %e A349864 a(10) = 32 since 2*(2+3) = 10 and no integer du < 32 gives u*(u+d) = 32. %Y A349864 Cf. A349278, A349865. %Y A349864 Cf. A349732 (similar, with first digits). %K A349864 nonn,base %O A349864 1,2 %A A349864 _Bernard Schott_, Dec 03 2021 %E A349864 a(64) and a(81) corrected by _Michel Marcus_, Dec 03 2021.