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Define the signature symmetry of a number n to be k if n-r and n+r have the same prime signature for r = 1 to k but not for k+1. Sequence contains the signature symmetry of n.

+0
6

0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0 (list; graph; listen)

	OFFSET	`1,12`
	COMMENT	`Subsidiary sequence: Indices of the first occurrence of n in this sequence.`
	EXAMPLE	`a(12) = 2 as 11 and 13 are both prime 10 and 14 both have prime signature p*q but 9 and 15 have distinct prime signature.`
	CROSSREFS	`Cf. A093489, A093491, A093492.` `Sequence in context: A127268 A083918 A083895 this_sequence A085858 A106671 A033776` `Adjacent sequences: A093485 A093486 A093487 this_sequence A093489 A093490 A093491`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 16 2004`
	EXTENSIONS	`More terms from Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), Jul 24 2006`

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Last modified March 20 09:10 EDT 2010. Contains 173642 sequences.

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