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A023527 Least odd prime divisor of p(n)*p(n-1) + 1, or 1 if p(n)*p(n-1) + 1 is a power of 2. 1
3, 7, 1, 3, 3, 3, 3, 3, 3, 167, 3, 7, 3, 3, 3, 7, 17, 3, 7, 3, 3, 7, 3, 1847, 3, 3, 3, 3, 3, 3, 3, 3, 7, 3, 3, 3, 5927, 7, 3, 31, 7, 3, 3, 3, 3, 3, 5, 7, 3, 3, 3, 6961, 3, 3, 16127, 7, 23, 3, 7, 3, 3, 3, 3, 3, 3, 3, 3, 79, 3, 3, 3, 7, 3, 7, 41, 3, 7, 3, 3, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..80.

Sean A. Irvine, Java program (github)

CROSSREFS

Sequence in context: A003118 A096409 A019631 * A016664 A197758 A071792

Adjacent sequences:  A023524 A023525 A023526 * A023528 A023529 A023530

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

Terms corrected by Sean A. Irvine, Jun 26 2019

STATUS

approved

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Last modified February 17 02:22 EST 2020. Contains 331976 sequences. (Running on oeis4.)