A003045 a(n) (n>6) is least integer > a(n-1) with precisely three representations a(n) = a(i) + a(j), 1 <= i < j < n, a(n) = n for n=1..6. (Formerly M0491)

1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 19, 21, 23, 25, 30, 44, 46, 48, 50, 55, 65, 73, 74, 77, 84, 86, 91, 95, 97, 114, 122, 123, 126, 133, 142, 144, 148, 162, 171, 173, 175, 190, 197, 205, 208, 216, 227, 232, 243, 244, 258, 265, 272, 278, 280, 291, 298, 309, 314, 326

Offset

1,2

References

R. K. Guy, Unsolved Problems in Number Theory, Section C4.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Seiichi Manyama, Table of n, a(n) for n = 1..10000

R. Queneau, Sur les suites s-additives, J. Combin. Theory, A12 (1972), 31-71.

Crossrefs

Cf. A003044.

Sequence in context: A182419 A033060 A060471 * A279079 A029750 A266480

Adjacent sequences: A003042 A003043 A003044 * A003046 A003047 A003048

Keyword

nonn

Author

N. J. A. Sloane

Extensions

Definition revised by Duncan Moore (duncan.moore(AT)gmx.com), Feb 20 2010

More terms from Jon E. Schoenfield, Mar 26 2010

Status

approved