A067685 Numbers n such that sigma(4n+1)=6n.

1, 8, 65, 96, 224, 560, 6734, 11648, 3588320, 67969536, 290575208, 1629860960, 4758938912, 10769110400

Offset

1,2

Links

Table of n, a(n) for n=1..14.

Mathematica

Select[Range[36*10^5], 6#==DivisorSigma[1, 4#+1]&] (* The program generates the first 9 terms of the sequence. *) (* Harvey P. Dale, Mar 20 2026 *)

Crossrefs

Sequence in context: A202783 A067215 A307436 * A304306 A316205 A305772

Adjacent sequences: A067682 A067683 A067684 * A067686 A067687 A067688

Keyword

nonn

Author

Benoit Cloitre, Feb 04 2002

Extensions

a(9)-a(14) from Donovan Johnson, Feb 01 2009

Status

approved