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 A318718 #5 Sep 02 2018 17:08:07 %S A318718 3,5,7,11,13,17,19,21,23,29,31,37,39,41,43,47,53,57,59,61,65,67,71,73, %T A318718 79,83,87,89,91,97,101,103,107,109,111,113,115,127,129,131,133,137, %U A318718 139,149,151,157,159,163,167,173,179,181,183,185,191,193,197,199 %N A318718 Heinz numbers of strict integer partitions with a common divisor > 1. %C A318718 The Heinz number of an integer partition (y_1, ..., y_k) is prime(y_1) * ... * prime(y_k). %t A318718 Select[Range[200],And[SquareFreeQ[#],GCD@@PrimePi/@FactorInteger[#][[All,1]]>1]&] %Y A318718 Cf. A000009, A000837, A051424, A078374, A289509, A302696, A302796, A302797, A303280, A305713. %K A318718 nonn %O A318718 1,1 %A A318718 _Gus Wiseman_, Sep 02 2018