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A152679
Even members of A000203, divided by 2.
2
2, 3, 6, 4, 9, 6, 14, 7, 12, 12, 9, 10, 21, 16, 18, 12, 30, 21, 20, 28, 15, 36, 16, 24, 27, 24, 19, 30, 28, 45, 21, 48, 22, 42, 39, 36, 24, 62, 36, 49, 27, 60, 36, 60, 40, 45, 30, 84, 31, 48, 52, 42, 72, 34, 63, 48, 72
OFFSET
1,1
LINKS
FORMULA
a(n) = A152678(n)/2.
MATHEMATICA
Select[Table[DivisorSigma[1, n]/2, {n, 1, 70}], IntegerQ](* Ivan Neretin, May 09 2015 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Omar E. Pol, Dec 10 2008
STATUS
approved