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A067684 Numbers n such that sigma(2n+1)=3n. 0
2, 16, 130, 192, 448, 1120, 13468, 23296, 7176640, 135939072, 581150416, 3259721920, 9517877824, 21538220800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

CROSSREFS

Sequence in context: A037517 A037720 A022018 * A074623 A323946 A275636

Adjacent sequences:  A067681 A067682 A067683 * A067685 A067686 A067687

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Feb 04 2002

EXTENSIONS

a(9)-a(14) from Donovan Johnson, Jan 31 2009

STATUS

approved

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Last modified June 19 11:23 EDT 2019. Contains 324219 sequences. (Running on oeis4.)