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 A023586 Exponent of least prime factor in prime factorization of 2*prime(n)-1. 1
 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 1, 4, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 3, 1, 1, 2, 2, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 3, 1, 1, 1, 1, 1, 1, 2, 1, 3, 4, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 3, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS First differs from A023584 at n = 56. - Sean A. Irvine, Jun 07 2019 LINKS Sean A. Irvine, Table of n, a(n) for n = 1..1000 PROG (PARI) a(n) = factor(2*prime(n)-1)[1, 2]; \\ Michel Marcus, Jun 08 2019 CROSSREFS Cf. A023854. Sequence in context: A307223 A321787 A331596 * A023584 A015182 A057559 Adjacent sequences:  A023583 A023584 A023585 * A023587 A023588 A023589 KEYWORD nonn AUTHOR EXTENSIONS Title corrected by Sean A. Irvine, Jun 07 2019 STATUS approved

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Last modified May 14 22:40 EDT 2021. Contains 343909 sequences. (Running on oeis4.)