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

Author

T. D. Noe, Mar 31 2010

Keywords

• nonn

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)

Crossrefs

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

Cf. A005231, A033880.

Programs

Mathematica

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