A072039 Row of Zorach additive triangle in which n appears (or 0 in the unlikely event that it does not).

1, 2, 2, 3, 5, 3, 4, 6, 3, 7, 4, 5, 6, 8, 9, 11, 4, 7, 10, 12, 13, 14, 5, 8, 6, 4, 15, 17, 9, 16, 7, 19, 18, 10, 11, 12, 21, 20, 22, 5, 13, 8, 14, 23, 24, 26, 27, 6, 15, 35, 25, 30, 9, 28, 29, 7, 16, 17, 31, 33, 18, 32, 10, 34, 19, 5, 36, 40, 11, 20, 12, 37, 8, 39, 21, 22, 13, 38, 45, 43

Offset

1,2

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

A. C. Zorach, Additive triangle

Haskell programs for sequences in connection with Zorach additive triangle

Formula

If a(n) > 0: n = A035312(a(n)-1, A072038(n)-1).

Example

a(8)=6 since 8 appears in the sixth row.

Prog

(Haskell) -- See link.

Crossrefs

Cf. A035312, A035311, A035313, A035358, A072038.

Sequence in context: A350167 A049840 A317018 * A204012 A131901 A204000

Adjacent sequences: A072036 A072037 A072038 * A072040 A072041 A072042

Keyword

nonn

Author

Henry Bottomley, Jun 07 2002

Status

approved