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A003044
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a(n) (n>4) is least integer > a(n-1) with precisely two representations a(n) = a(i) + a(j), 1<=i<j<n.
(Formerly M0506)
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3
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1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 19, 29, 31, 33, 43, 44, 47, 51, 54, 58, 68, 69, 78, 79, 86, 95, 99, 110, 113, 117, 133, 134, 135, 145, 151, 156, 159, 173, 180, 183, 193, 197, 204, 211, 229, 232, 236, 239, 243, 250, 256, 264, 270, 281, 284
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 145-151.
R. K. Guy, Unsolved Problems in Number Theory, Section C4.
R. Queneau, Sur les suites s-additives, J. Combin. Theory, A12 (1972), 31-71.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..5440
S. R. Finch, Ulam s-Additive Sequences
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CROSSREFS
| Sequence in context: A018350 A033058 A060470 * A018541 A018293 A015702
Adjacent sequences: A003041 A003042 A003043 * A003045 A003046 A003047
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Queneau left out 44.
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