A090926 - OEIS

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A090926

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

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; refs; listen; history; internal format)

	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: A185688 A203955 A039638 * A023503 A039640 A053811` `Adjacent sequences: A090923 A090924 A090925 * 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 February 17 06:27 EST 2012. Contains 205998 sequences.