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 A001211 a(n) = solution to the postage stamp problem with 6 denominations and n stamps. (Formerly M4136 N1836) 21
 6, 20, 52, 108, 211, 388, 664, 1045, 1617, 2510, 3607, 5118, 7066, 9748, 12793, 17061, 22342, 28874, 36560, 45745, 57814, 72997, 87555, 106888, 129783 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Fred Lunnon [W. F. Lunnon] defines "solution" to be the smallest value not obtainable by the best set of stamps. The solutions given are one lower than this, that is, the sequence gives the largest number obtainable without a break using the best set of stamps. REFERENCES R. K. Guy, Unsolved Problems in Number Theory, C12. N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS R. Alter and J. A. Barnett, A postage stamp problem, Amer. Math. Monthly, 87 (1980), 206-210. M. F. Challis, Two new techniques for computing extremal h-bases A_k, Comp. J. 36(2) (1993) 117-126. M. F. Challis and J. P. Robinson, Some Extremal Postage Stamp Bases, J. Integer Seq., 13 (2010), Article 10.2.3. Erich Friedman, Postage stamp problem W. F. Lunnon, A postage stamp problem, Comput. J. 12 (1969) 377-380. Eric Weisstein's World of Mathematics, Postage stamp problem CROSSREFS Postage stamp sequences: A001208, A001209, A001210, A001211, A001212, A001213, A001214, A001215, A001216, A005342, A005343, A005344, A014616, A053346, A053348, A075060, A084192, A084193. A row or column of the array A196416 (possibly with 1 subtracted from it). Sequence in context: A266760 A213586 A119365 * A122225 A275112 A027178 Adjacent sequences:  A001208 A001209 A001210 * A001212 A001213 A001214 KEYWORD nonn,more AUTHOR EXTENSIONS a(11)-a(15) from Challis entered by R. J. Mathar, Apr 01 2006 Entry improved by comments from John Seldon (johnseldon(AT)onetel.com), Sep 15 2004 a(16)-a(25) from Challis and Robinson entered by John P Robinson (john-robinson(AT)uiowa.edu), Feb 18 2010 STATUS approved

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Last modified October 16 08:50 EDT 2019. Contains 328056 sequences. (Running on oeis4.)