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A069353 Numbers of form 2^i*3^j - 1 with i, j >= 0. 5
0, 1, 2, 3, 5, 7, 8, 11, 15, 17, 23, 26, 31, 35, 47, 53, 63, 71, 80, 95, 107, 127, 143, 161, 191, 215, 242, 255, 287, 323, 383, 431, 485, 511, 575, 647, 728, 767, 863, 971, 1023, 1151, 1295, 1457, 1535, 1727, 1943, 2047, 2186 (list; graph; refs; listen; history; text; internal format)
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: A278591 A191121 A026401 * A300163 A352204 A224858
Adjacent sequences: A069350 A069351 A069352 * A069354 A069355 A069356
nonn
Reinhard Zumkeller, Mar 18 2002
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Last modified February 1 12:28 EST 2023. Contains 359993 sequences. (Running on oeis4.)