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 A013921 a(n) is composite and is sum of first k composites for some k. 4
 4, 10, 18, 27, 49, 63, 78, 94, 112, 132, 153, 175, 224, 250, 305, 335, 400, 434, 469, 505, 543, 582, 622, 664, 708, 753, 799, 847, 896, 946, 1158, 1214, 1271, 1329, 1389, 1514, 1578, 1643, 1846, 1916, 1988, 2062, 2290, 2368, 2448, 2529, 2611, 2695, 2780, 2866 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..10000 MATHEMATICA Module[{nn=100, comps}, comps=Complement[Range[4, nn], Prime[ Range[ PrimePi[ nn]]]]; Select[Accumulate[comps], !PrimeQ[#]&]] (* Harvey P. Dale, May 21 2014 *) CROSSREFS Cf. A013919, A013920. Sequence in context: A172484 A009876 A161958 * A028552 A217748 A009877 Adjacent sequences:  A013918 A013919 A013920 * A013922 A013923 A013924 KEYWORD nonn AUTHOR EXTENSIONS More terms from David W. Wilson STATUS approved

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Last modified July 23 13:49 EDT 2019. Contains 325254 sequences. (Running on oeis4.)