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A138981 a(n) = Sum_{k=0..n} A138980(k). 2
1, 4, 9, 16, 27, 40, 57, 76, 99, 128, 159, 196, 237, 280, 327, 380, 441, 508, 579, 652, 731, 814, 903, 1000, 1101, 1204, 1311, 1420, 1533, 1660, 1791, 1928, 2067, 2216, 2367, 2524, 2691, 2864, 3043, 3224, 3415, 3608, 3805, 4004, 4215, 4438, 4665, 4894 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

By definition, every term is nonprime (i.e., is 1 or composite).

LINKS

Table of n, a(n) for n=0..47.

CROSSREFS

Cf. A138980.

Sequence in context: A213495 A109593 A237589 * A138993 A339330 A008019

Adjacent sequences:  A138978 A138979 A138980 * A138982 A138983 A138984

KEYWORD

nonn

AUTHOR

Leroy Quet, Apr 05 2008

EXTENSIONS

Extended by R. J. Mathar, May 21 2010

STATUS

approved

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Last modified October 3 09:59 EDT 2022. Contains 357231 sequences. (Running on oeis4.)