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 A093817 Largest prime factor of 2^n-3. 2
 1, 5, 13, 29, 61, 5, 23, 509, 1021, 409, 4093, 431, 16381, 6553, 71, 2473, 23831, 97, 1048573, 2713, 4194301, 1677721, 16777213, 70051, 5197, 31033, 1877171, 536870909, 46684427, 22605091, 464773, 296204641, 3360037, 6871947673, 283007 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 2..200 MATHEMATICA PrimeFactors[n_] := Flatten[ Table[ # [[1]], {1}] & /@ FactorInteger[n]]; Table[ PrimeFactors[2^n - 3][[ -1]], {n, 2, 46}] (* Robert G. Wilson v, May 24 2004 *) Table[FactorInteger[2^n-3][[-1, 1]], {n, 2, 40}] (* Harvey P. Dale, Feb 01 2015 *) CROSSREFS Cf. A093810, A050414, A050415. Sequence in context: A023619 A020576 A093810 * A120274 A036982 A029580 Adjacent sequences:  A093814 A093815 A093816 * A093818 A093819 A093820 KEYWORD nonn AUTHOR Yasutoshi Kohmoto, May 11 2004 EXTENSIONS More terms from Robert G. Wilson v, May 24 2004 Typo in Mathematica code corrected by Vincenzo Librandi, May 14 2013 STATUS approved

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Last modified October 15 13:06 EDT 2019. Contains 328030 sequences. (Running on oeis4.)