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1,3
Are there infinitely many primes in this sequence? See A005105.
If m is a term then also 2*m + 1 and 3*m + 2.
G. Everest, P. Rogers and T. Ward, A higher-rank Mersenne problem, pp. 95-107 of ANTS 2002, Lect. Notes Computer Sci. 2369 (2002).
Table of n, a(n) for n=1..49.
a(n) = A003586(n)-1.
Cf. A055600, A069355, A005105.
Sequence in context: A190810 A191121 A026401 * A224858 A090704 A112055
Adjacent sequences: A069350 A069351 A069352 * A069354 A069355 A069356
nonn
Reinhard Zumkeller, Mar 18 2002
approved