OFFSET
1,1
COMMENTS
A242331 gives the corresponding values of k.
FORMULA
a(n) = A242331(n)^2 + 3.
EXAMPLE
259 is a term because 16^2 + 3 = 259 = 7*37.
MATHEMATICA
Select[Range[0, 200]^2 + 3, PrimeOmega[#] == 2 &] (* Amiram Eldar, Feb 18 2023 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Elmo R. Oliveira, Feb 18 2023
STATUS
approved