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A090926 Least odd prime divisor of prime(n)-1, or a(n) = 2 if no odd prime divisors are encountered. 0
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; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..86.

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 A241195 A039640

Adjacent sequences:  A090923 A090924 A090925 * A090927 A090928 A090929

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy, Dec 26 2003

EXTENSIONS

More terms from Erich Friedman, Aug 08 2005

STATUS

approved

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Last modified January 20 01:01 EST 2022. Contains 350467 sequences. (Running on oeis4.)