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 A349939 #15 Aug 14 2024 16:54:11 %S A349939 187,245,275,403,425,427,437,473,583,605,637,665,731,763,775,805,845, %T A349939 847,875,893,931,1003,1075,1085,1127,1183,1235,1265,1267,1309,1357, %U A349939 1375,1397,1421,1435,1445,1463,1525,1547,1573,1577,1615,1625,1643,1645,1705,1757 %N A349939 Terms in A328897 that are not divisible by 3: numbers k > 1 not divisible by 2 or 3 such that A005179(k-1) > A005179(k) < A005179(k+1). %C A349939 Numbers k not divisible by 2 or 3 such that, the smallest number with exactly k divisors is smaller than the smallest number with exactly k-1 or k+1 divisors. %H A349939 Matthew House, <a href="/A349939/b349939.txt">Table of n, a(n) for n = 1..10000</a> %e A349939 The smallest numbers with exactly 186, 187 and 188 divisors are 48318382080, 3869835264 and 1055531162664960 respectively. The smallest number with exactly 187 divisors is smaller than the smallest number with exactly 186 or 188 divisors, and 187 is not divisible by 2 or 3, so 187 is a term. %e A349939 The smallest numbers with exactly 244, 245 and 246 divisors are 17293822569102704640, 29160000 and 49478023249920 respectively. The smallest number with exactly 245 divisors is smaller than the smallest number with exactly 244 or 246 divisors, and 245 is not divisible by 2 or 3, so 245 is a term. %o A349939 (PARI) isA349939(k) = (k%2&&k%3&&k>1) && A005179(k)<A005179(k-1) && A005179(k)<A005179(k+1) \\ See A005179 for its program %Y A349939 Cf. A005179, A328897, A349940. %K A349939 nonn %O A349939 1,1 %A A349939 _Jianing Song_, Dec 05 2021