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A062967 2*(sigma(n)-n-1)+1. 0
-1, 1, 1, 5, 1, 11, 1, 13, 7, 15, 1, 31, 1, 19, 17, 29, 1, 41, 1, 43, 21, 27, 1, 71, 11, 31, 25, 55, 1, 83, 1, 61, 29, 39, 25, 109, 1, 43, 33, 99, 1, 107, 1, 79, 65, 51, 1, 151, 15, 85, 41, 91, 1, 131, 33, 127, 45, 63, 1, 215, 1, 67, 81, 125, 37, 155, 1, 115, 53, 147, 1, 245, 1, 79, 97, 127, 37, 179, 1, 211, 79, 87, 1, 279, 45, 91, 65 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

PROG

(PARI) j=[]; for(n=1, 200, j=concat(j, 2*(sigma(n)-n-1)+1)); j

CROSSREFS

Cf. A007593.

Sequence in context: A013612 A112830 A189745 * A067292 A131782 A185953

Adjacent sequences:  A062964 A062965 A062966 * A062968 A062969 A062970

KEYWORD

easy,sign

AUTHOR

Jason Earls (zevi_35711(AT)yahoo.com), Jul 23 2001

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Last modified February 15 03:59 EST 2012. Contains 205694 sequences.