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 A128404 Numbers n such that n^2 divides 24^n-1. 14
 1, 23, 1081, 2870377, 7009273, 15954479, 134907719, 329435831, 537539141, 15001987199, 874750261127, 1991103024721, 4272172921319, 4862143429729, 7933540182019, 12816504745411, 41113262272969, 67084347257659 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 23 divides all except the first term. LINKS MATHEMATICA a={}; Do[r=(24^n-1)/n^2; If[r==IntegerPart[r], AppendTo[a, n]], {n, 1, 10^3}]; a (* Vladimir Joseph Stephan Orlovsky, Aug 07 2008 *) CROSSREFS Cf. A127103, A127104, A127105, A127106, A127107, A127102, A127101, A127100, A127092, A128405, A128393, A128394, A128395, A128396, A128397, A128398, A128399, A128400, A128401, A128402, A128403. Sequence in context: A174748 A042015 A042012 * A126741 A273477 A202656 Adjacent sequences:  A128401 A128402 A128403 * A128405 A128406 A128407 KEYWORD nonn,less AUTHOR Alexander Adamchuk, Mar 01 2007 EXTENSIONS a(5)-a(6) from Farideh Firoozbakht, Mar 05 2007 4 more terms from Ryan Propper, Feb 23 2008 Terms a(11) onward from Max Alekseyev, May 06 2010 STATUS approved

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Last modified March 23 18:13 EDT 2019. Contains 321433 sequences. (Running on oeis4.)