OFFSET
1,2
COMMENTS
Squares k such that the squarefree kernel of k is primorial.
1 is the only primorial term.
From Michael De Vlieger, Jun 09 2024: (Start)
Contains k^2 such that k is a product of primorials, i.e., A025487(i)^2, i >= 1, since A025487 is a proper subset of A055932.
(End)
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A055932(n)^2.
EXAMPLE
MATHEMATICA
{1}~Join~Select[Range[2, 512, 2], Or[# == {2}, Union@ Differences@ PrimePi[#] == {1}] &@ FactorInteger[#][[All, 1]] &]^2 (* Michael De Vlieger, Jun 09 2024 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
David James Sycamore, Jun 09 2024
EXTENSIONS
More terms from David A. Corneth, Jun 09 2024
STATUS
approved