A007087 Next term is uniquely the sum of 3 earlier terms. (Formerly M1035)

1, 2, 4, 7, 10, 12, 16, 17, 32, 36, 42, 57, 72, 73, 98, 102, 104, 129, 159, 164, 174, 189, 199, 221, 224, 255, 286, 287, 347, 372, 378, 403, 428, 443, 444, 469, 494, 529, 560, 586

Offset

1,2

References

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

M. C. Wunderlich, The improbable behavior of Ulam's summation sequence, pp. 249-257 of A. O. L. Atkin and B. J. Birch, editors, Computers in Number Theory. Academic Press, NY, 1971.

Links

Table of n, a(n) for n=1..40.

R. G. Wilson, V, Letter to N. J. A. Sloane, Sep. 1992

Crossrefs

Sequence in context: A089972 A276209 A062429 * A101359 A007303 A102988

Adjacent sequences: A007084 A007085 A007086 * A007088 A007089 A007090

Keyword

nonn

Author

N. J. A. Sloane, Robert G. Wilson v

Status

approved