

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
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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

Table of n, a(n) for n=1..25.
R. Alter and J. A. Barnett, A postage stamp problem, Amer. Math. Monthly, 87 (1980), 206210.
M. F. Challis, Two new techniques for computing extremal hbases A_k, Comp. J. 36(2) (1993) 117126.
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) 377380.
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

N. J. A. Sloane.


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 (johnrobinson(AT)uiowa.edu), Feb 18 2010


STATUS

approved



