id:A016016 - OEIS Search Results

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Number of iterations of Reverse and Add which lead to a palindrome, or -1 if no palindrome is ever reached.

+0
7

1, 1, 1, 1, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 1, 1, 1, 1, 1, 2, 1, 2, 2, 3, 1, 1, 1, 1, 2, 1, 2, 2, 3, 4, 1, 1, 1, 2, 1, 2, 2, 3, 4, 6, 1, 1, 2, 1, 2, 2, 3, 4, 6, 24, 1, 2, 1, 2, 2, 3, 4, 6, 24 (list; graph; listen)

	OFFSET	`1,5`
	COMMENT	`Palindromes themselves are also 'Reverse and Add!'ed !` `It is conjectured that a(196) = -1 - see A006860, A023108.`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..195` `Index entries for sequences related to Reverse and Add!` `J. Walker, Three Years Of Computing: Final Report On The Palindrome Quest`
	EXAMPLE	`6 -> 6 + 6 = 12 -> 12 + 21 = 33 is palindromic, took 2 steps so a(6)=2.`
	CROSSREFS	`Cf. A033665, A023109, A006960.` `Adjacent sequences: A016013 A016014 A016015 this_sequence A016017 A016018 A016019` `Sequence in context: A037806 A038082 A107740 this_sequence A063059 A102675 A031346`
	KEYWORD	`nonn,base,nice`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com)`

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Last modified May 16 01:24 EDT 2008. Contains 139630 sequences.

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