A081867 a(n)=sigma_11(2n-1).

1, 177148, 48828126, 1977326744, 31381236757, 285311670612, 1792160394038, 8649804864648, 34271896307634, 116490258898220, 350279478046112, 952809757913928, 2384185839843751, 5559091947792280, 12200509765705830

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Mathematica

Table[DivisorSigma[11, 2n-1], {n, 20}] (* Harvey P. Dale, Jun 26 2012 *)

Crossrefs

Cf. A013959.

Sequence in context: A017435 A017567 A321815 * A133972 A233480 A233475

Adjacent sequences: A081864 A081865 A081866 * A081868 A081869 A081870

Keyword

nonn

Author

Benoit Cloitre, Apr 12 2003

Status

approved