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 A128472 a(n) is the smallest prime of the form (2n-1)^k - 2 for k > (2n-1), or 0 if no such number exists. 13
 0, 79, 6103515623, 5764799, 31381059607 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(6) = 11^22420 - 2 was found by Rick L. Shepherd on Sep 29 2007. It has 23349 decimal digits and it is too large to include. a(7) through a(12): {771936328432730777189183517369830159827426282764863750131729657829597399846468418688727, 98526125335693359373, 339448671314611904643504117119, 37589973457545958193355599, 1136272165922724266740722458520499, 480250763996501976790165756943039}. LINKS Table of n, a(n) for n=1..5. Henri Lifchitz and Renaud Lifchitz: PRP Records. Probable Primes Top 10000. CROSSREFS Cf. A084714 (smallest prime of the form (2n-1)^k - 2). Cf. A133856 (least number k > (2n-1) such that (2n-1)^k - 2 is prime). Cf. A014224, A109080, A090669, A128455, A128457, A128458, A128459, A128460, A128461. Cf. A133858, A133982. Sequence in context: A265589 A116327 A060711 * A243432 A093404 A236236 Adjacent sequences: A128469 A128470 A128471 * A128473 A128474 A128475 KEYWORD nonn AUTHOR Alexander Adamchuk, Mar 14 2007, Oct 01 2007 EXTENSIONS Edited by Max Alekseyev, Sep 18 2009 STATUS approved

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Last modified May 29 04:26 EDT 2024. Contains 372921 sequences. (Running on oeis4.)