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A072038 Column of Zorach additive triangle in which n appears (or 0 in the unlikely event that it does not). 4
1, 1, 2, 1, 1, 2, 1, 1, 3, 1, 2, 2, 2, 1, 1, 1, 3, 2, 1, 1, 1, 1, 3, 2, 3, 4, 1, 1, 2, 1, 3, 1, 1, 2, 2, 2, 1, 1, 1, 4, 2, 3, 2, 1, 1, 1, 1, 4, 2, 1, 1, 1, 3, 1, 1, 4, 2, 2, 1, 1, 2, 1, 3, 1, 2, 5, 1, 1, 3, 2, 3, 1, 4, 1, 2, 2, 3, 1, 1, 1, 1, 1, 2, 3, 1, 1, 1, 5, 2, 1, 1, 3, 2, 1, 4, 2, 2, 1, 1, 1, 2, 1, 1, 5, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

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(A072039(n)-1, a(n)-1).

EXAMPLE

a(8)=1 since 8 appears in the first (i.e. left hand) column.

PROG

(Haskell) See link.

CROSSREFS

If a(n)=1 then n is in A035311, if a(n)=A072039(n) then n is in A035313. Cf. A035312, A035358, A072039.

Sequence in context: A281681 A218799 A078770 * A284315 A262928 A228429

Adjacent sequences:  A072035 A072036 A072037 * A072039 A072040 A072041

KEYWORD

nonn

AUTHOR

Henry Bottomley, Jun 07 2002

STATUS

approved

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Last modified November 18 17:45 EST 2019. Contains 329287 sequences. (Running on oeis4.)