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A074121 Group successively larger composite numbers so that the sum of the n-th group is a multiple of n. Sequence gives the first term in each group. 3
4, 6, 8, 12, 14, 18, 20, 24, 25, 36, 48, 52, 69, 104, 112, 129, 160, 187, 207, 243, 259, 291, 301, 310, 315, 333, 356, 361, 388, 425, 450, 471, 519, 528, 608, 633, 665, 668, 687, 721, 783, 790, 875, 897, 994, 1016, 1047, 1138, 1174, 1179, 1274, 1278, 1344 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..53.

MATHEMATICA

NextComposite[n_] := Block[{k = n + 1}, While[PrimeQ[k], k++ ]; k]; a = {}; k = 1; Do[s = 0; a = Append[a, NextComposite[k]]; While[k = NextComposite[k]; s = s + k; ! IntegerQ[s/n], ], {n, 1, 55}]; a

CROSSREFS

Cf. A002808, A074129, A074120, A074122, A074123.

Sequence in context: A028876 A271346 A053579 * A175088 A275671 A055670

Adjacent sequences:  A074118 A074119 A074120 * A074122 A074123 A074124

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Aug 27 2002

EXTENSIONS

Edited, corrected and extended by Robert G. Wilson v, Aug 29 2002

STATUS

approved

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Last modified April 9 20:46 EDT 2020. Contains 333363 sequences. (Running on oeis4.)