OFFSET
1,1
COMMENTS
Differs from A080259 in that this sequence includes 18.
Differs from A093373 in that this sequence does not include 30.
Primorials P(n) = A002110(n) are not in this sequence.
Does not contain powers of 2.
Contains odd numbers k > 1.
Numbers that are not the first with their prime signature, complement of A025487. - Peter Munn, Jan 24 2024
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
FORMULA
MATHEMATICA
Select[Range[210], Nor[# == 1, IntegerQ@ Log2[#], And[EvenQ[#1], Union@ Differences@ PrimePi[#2[[All, 1]]] == {1}, AllTrue[Differences@ #2[[All, -1]], # <= 0 &]]] & @@ {#, FactorInteger[#]} &]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Michael De Vlieger, Jan 21 2024
STATUS
approved