A174865 Odd abundant numbers whose abundance is even.

945, 1575, 2205, 2835, 3465, 4095, 4725, 5355, 5775, 5985, 6435, 6615, 6825, 7245, 7425, 7875, 8085, 8415, 8505, 8925, 9135, 9555, 9765, 10395, 11655, 12285, 12705, 12915, 13545, 14175, 14805, 15015, 15435, 16065, 16695, 17325, 17955, 18585

Offset

1,1

Comments

This is a subsequence of the odd abundant numbers, A005231. The first term in A005231 but not in this sequence is 11025.

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1989 from T. D. Noe)

Mathematica

goodQ[n_] := Module[{ds=DivisorSigma[1, n]}, ds>2n && EvenQ[ds]]; Select[Range[1, 1000000, 2], goodQ]

Crossrefs

Cf. A156942 (Odd abundant numbers whose abundance is odd).

Cf. A005231, A033880.

Sequence in context: A252192 A252185 A005231 * A174535 A243104 A006038

Adjacent sequences: A174862 A174863 A174864 * A174866 A174867 A174868

Keyword

nonn

Author

T. D. Noe, Mar 31 2010

Status

approved