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 A023591 Greatest exponent in prime-power factorization of 2*prime(n)+1. 2
 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 3, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 2, 1, 1, 3, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 3, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 LINKS MAPLE A023591 := proc(n)     A051903(2*ithprime(n)+1) ; end proc: # R. J. Mathar, Jul 08 2015 PROG (PARI) a(n) = vecmax(factor(2*prime(n)+1)[, 2]); \\ Michel Marcus, Apr 20 2021 CROSSREFS Cf. A051903, A072055. Sequence in context: A030348 A143811 A109673 * A165661 A107711 A242345 Adjacent sequences:  A023588 A023589 A023590 * A023592 A023593 A023594 KEYWORD nonn AUTHOR STATUS approved

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Last modified December 2 08:31 EST 2021. Contains 349437 sequences. (Running on oeis4.)