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A242083
3^p - 2^p - 1, where p is prime.
2
4, 18, 210, 2058, 175098, 1586130, 129009090, 1161737178, 94134790218, 68629840493970, 617671248800298, 450283768452043890, 36472994178147530850, 328256958598444055418, 26588814218220014932458, 19383245658672820642055730
OFFSET
1,1
COMMENTS
For p>3, all terms are divisible by 42.
LINKS
FORMULA
a(n) = abs(A083321(A000040(n))). - Michel Marcus, May 05 2014
MATHEMATICA
Table[(3^Prime[n] - 2^Prime[n] - 1), {n, 1, 30}]
3^#-2^#-1&/@Prime[Range[20]] (* Harvey P. Dale, Aug 05 2016 *)
PROG
(Magma) [3^p-2^p-1: p in PrimesUpTo(60)]
(PARI) a(n) = my(p = prime(n)); 3^p-2^p-1; \\ Michel Marcus, May 05 2014
(Sage) [3^p-2^p-1 for p in primes(60)] # Bruno Berselli, May 12 2014
CROSSREFS
Sequence in context: A174663 A356561 A197786 * A327335 A275965 A363313
KEYWORD
nonn,easy,changed
AUTHOR
Vincenzo Librandi, May 04 2014
STATUS
approved