OFFSET
1,2
COMMENTS
If conjecture (2) in A352187 is true, this is a duplicate of A008578 (1 together with primes). - R. J. Mathar, Mar 20 2022
LINKS
N. J. A. Sloane, Table of n, a(n) for n = 1..662
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 12 2022
STATUS
approved