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 A167758 #8 Aug 20 2025 16:28:43 %S A167758 1,24,30,36,40,42,48,54,56,66,70,78,80,88,100,102,104,105,110,112,114, %T A167758 120,128,130,135,136,138,144,152,154,162,165,168,170,174,176,182,184, %U A167758 186,189,190,192,195,196,208,210,216,222,225,230,231,232,238,240,246 %N A167758 Numbers k such that d(k) = nonisolated nonprime. %C A167758 Where 0, 1, 8, 9, 10, 14, 15, 16, 20,.. are nonisolated nonprimes A164276. Numbers k such that number of divisors of k is nonisolated nonprime. Or, the positions of nonisolated nonprimes in A000005. %F A167758 A000005(a(n))=nonisolated nonprime. %e A167758 A000005(1=a(1))=1; A000005(24=a(2))=8; A000005(30=a(3))=8; A000005(36=a(4))=9. %Y A167758 Cf. A000005, A164276. %K A167758 nonn %O A167758 1,2 %A A167758 _Juri-Stepan Gerasimov_, Nov 10 2009 %E A167758 Corrected (152 inserted) by _R. J. Mathar_, May 30 2010