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A146076 Sum of even divisors of n. 5
0, 2, 0, 6, 0, 8, 0, 14, 0, 12, 0, 24, 0, 16, 0, 30, 0, 26, 0, 36, 0, 24, 0, 56, 0, 28, 0, 48, 0, 48, 0, 62, 0, 36, 0, 78, 0, 40, 0, 84, 0, 64, 0, 72, 0, 48, 0, 120, 0, 62, 0, 84, 0, 80, 0, 112, 0, 60, 0, 144, 0, 64, 0, 126, 0, 96, 0, 108, 0, 96, 0, 182, 0, 76, 0, 120, 0, 112, 0, 180, 0, 84, 0, 192, 0, 88, 0, 168, 0, 156, 0, 144, 0, 96, 0, 248, 0, 114, 0, 186, 0, 144, 0, 196, 0, 108, 0, 240, 0, 144, 0, 240, 0, 160, 0, 180, 0, 120, 0, 336 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The usual OEIS policy is not to include sequences like this where alternate terms are zero; this is an exception. A074400 is the main entry.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..10000

FORMULA

a(2n+1) = 0, a(2n) = 2*sigma(n).

MATHEMATICA

f[n_] := Plus @@ Select[Divisors[n], EvenQ]; Array[f, 150] (* Vincenzo Librandi, May 17 2013 *)

CROSSREFS

Cf. A000203, A000593, A074400, A183063.

Sequence in context: A162974 A178636 A046520 * A157195 A019781 A167294

Adjacent sequences:  A146073 A146074 A146075 * A146077 A146078 A146079

KEYWORD

nonn,easy,changed

AUTHOR

N. J. A. Sloane, Apr 09 2009

EXTENSIONS

Corrected by Jaroslav Krizek, May 07 2011.

STATUS

approved

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Last modified May 24 07:09 EDT 2013. Contains 225617 sequences.