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 A242084 5^p - 4^p - 1, where p is prime. 2
 8, 60, 2100, 61740, 44633820, 1153594260, 745759583940, 18798608421180, 11850560210900460, 185976284546943991380, 4652001187058965190220, 72740686675902780452348340, 45469899385367953379053128420 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS For p>3 all terms are divisible by 21. LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..100 FORMULA a(n) = A054401(A000040(n)). - Michel Marcus, May 05 2014 MATHEMATICA Table[5^Prime[n] - 4^Prime[n] - 1, {n, 1, 60}] PROG (MAGMA) [5^p-4^p-1: p in PrimesUpTo(60)]; (PARI) a(n) = my(p = prime(n)); 5^p - 4^p - 1; \\ Michel Marcus, May 05 2014 CROSSREFS Cf. A204768. Sequence in context: A099337 A075147 A034664 * A007399 A071401 A247535 Adjacent sequences:  A242081 A242082 A242083 * A242085 A242086 A242087 KEYWORD nonn,less AUTHOR Vincenzo Librandi, May 04 2014 STATUS approved

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Last modified February 26 00:52 EST 2020. Contains 332270 sequences. (Running on oeis4.)