id:A090926 - OEIS Search Results

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Least odd prime divisor of prime(n)-1, or a(n) = 2 if no odd prime divisors are encountered.

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2, 2, 3, 5, 3, 2, 3, 11, 7, 3, 3, 5, 3, 23, 13, 29, 3, 3, 5, 3, 3, 41, 11, 3, 5, 3, 53, 3, 7, 3, 5, 17, 3, 37, 3, 3, 3, 83, 43, 89, 3, 5, 3, 7, 3, 3, 3, 113, 3, 29, 7, 3, 5, 2, 131, 67, 3, 3, 5, 3, 73, 3, 5, 3, 79, 3, 3, 173, 3, 11, 179, 3, 3, 3, 191, 97, 3, 5, 3, 11, 3, 5, 3, 3, 13 (list; graph; listen)

	OFFSET	`2,1`
	EXAMPLE	`a(8) = 2 as prime(8) = 17 and 17-1 = 2^4.` `a(10) = 7 as prime(10) = 29 and 29-1 =28 = 2*7^2.`
	CROSSREFS	`Sequence in context: A152430 A117918 A039638 this_sequence A023503 A039640 A053811` `Adjacent sequences: A090923 A090924 A090925 this_sequence A090927 A090928 A090929`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 26 2003`
	EXTENSIONS	`More terms from Erich Friedman (efriedma(AT)stetson.edu), Aug 08 2005`

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Last modified December 20 16:13 EST 2009. Contains 171081 sequences.

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