cp's OEIS Frontend

A325511 Numbers whose prime signature is that of a factorial number.

%I A325511 #5 May 08 2019 22:20:04
%S A325511 1,2,3,5,6,7,10,11,13,14,15,17,19,21,22,23,24,26,29,31,33,34,35,37,38,
%T A325511 39,40,41,43,46,47,51,53,54,55,56,57,58,59,61,62,65,67,69,71,73,74,77,
%U A325511 79,82,83,85,86,87,88,89,91,93,94,95,97,101,103,104,106
%N A325511 Numbers whose prime signature is that of a factorial number.
%C A325511 A181819(a(n)) belongs to A325508.
%e A325511 The sequence of terms together with their prime indices begins:
%e A325511    1: {}
%e A325511    2: {1}
%e A325511    3: {2}
%e A325511    5: {3}
%e A325511    6: {1,2}
%e A325511    7: {4}
%e A325511   10: {1,3}
%e A325511   11: {5}
%e A325511   13: {6}
%e A325511   14: {1,4}
%e A325511   15: {2,3}
%e A325511   17: {7}
%e A325511   19: {8}
%e A325511   21: {2,4}
%e A325511   22: {1,5}
%e A325511   23: {9}
%e A325511   24: {1,1,1,2}
%e A325511   26: {1,6}
%e A325511   29: {10}
%e A325511   31: {11}
%t A325511 Select[Range[30],MemberQ[Table[Sort[Last/@FactorInteger[k!]],{k,#}],Sort[Last/@FactorInteger[#]]]&]
%Y A325511 Cf. A000142, A011371, A022559, A076934, A115627, A181819, A325272, A325276, A325508, A325509, A325510.
%K A325511 nonn
%O A325511 1,2
%A A325511 _Gus Wiseman_, May 08 2019