A035358 - OEIS

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A035358

k such that A035312(k-1)=n or 0 if there is none.

1, 2, 3, 4, 11, 5, 7, 16, 6, 22, 8, 12, 17, 29, 37, 56, 9, 23, 46, 67, 79, 92, 13, 30, 18, 10, 106, 137, 38, 121, 24, 172, 154, 47, 57, 68, 211, 191, 232, 14, 80, 31, 93, 254, 277, 326, 352, 19, 107, 596, 301, 436, 39, 379, 407, 25, 122, 138, 466, 529, 155, 497, 48 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`At least up through the first 19 terms (ending at 46), this appears to be identical to the inverse of sequence A035312 considered as a permutation of the positive integers. - Howard A. Landman (howard(AT)polyamory.org), Sep 23 2001` `This sequence is by definition the inverse of A035312 (upon shifting its offset), provided that A035312 indeed is surjective on the positive integers. - M. F. Hasler, May 09 2013`
	LINKS	`_Reinhard Zumkeller_, Table of n, a(n) for n = 1..1000` `A. C. Zorach, Additive triangle` `Index entries for sequences that are permutations of the natural numbers` `Haskell programs for sequences in connection with Zorach additive triangle`
	FORMULA	`a(n) = A000217(A072039(n) - 1) + A072038(n) if the sequence is in fact the inverse permutation of the flattened Zorach additive triangle. [Reinhard Zumkeller, Apr 30 2011]`
	PROG	`See link for Haskell program.`
	CROSSREFS	`Cf. A035311-A035313.` `Sequence in context: A045924 A068910 A146027 * A065633 A160652 A131485` `Adjacent sequences: A035355 A035356 A035357 * A035359 A035360 A035361`
	KEYWORD	`nonn,changed`
	AUTHOR	`Christian G. Bower, Nov 15 1998.`
	STATUS	`approved`

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Last modified May 21 06:04 EDT 2013. Contains 225475 sequences.