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A069353 Numbers of form 2^i*3^j - 1 with i, j >= 0. 4
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)
OFFSET

1,3

COMMENTS

Are there infinitely many primes in this sequence? See A005105.

If m is a term then also 2*m + 1 and 3*m + 2.

REFERENCES

G. Everest, P. Rogers and T. Ward, A higher-rank Mersenne problem, pp. 95-107 of ANTS 2002, Lect. Notes Computer Sci. 2369 (2002).

LINKS

Table of n, a(n) for n=1..49.

FORMULA

a(n) = A003586(n)-1.

CROSSREFS

Cf. A055600, A069355, A005105.

Sequence in context: A190810 A191121 A026401 * A224858 A090704 A112055

Adjacent sequences:  A069350 A069351 A069352 * A069354 A069355 A069356

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Mar 18 2002

STATUS

approved

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Last modified April 20 01:48 EDT 2014. Contains 240777 sequences.