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A061157 n.2^m-1 is prime for exactly one exponent m in the range 0<=m<=n. 1
11, 22, 37, 74, 109, 151, 247, 253, 337, 382, 403, 506, 509, 547, 674, 739, 764, 779, 806, 1325, 1478, 1528, 1558, 1589, 1597, 1612, 1871, 1987, 2263, 2279, 2317, 2759, 2797, 3056, 3116, 3194, 3329, 3341, 3719, 3742, 3761, 3821, 4001 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..42.

CROSSREFS

Cf. A061153-A061156. See A066158 for exponents.

Sequence in context: A101145 A109016 A084025 * A144378 A026037 A266088

Adjacent sequences:  A061154 A061155 A061156 * A061158 A061159 A061160

KEYWORD

nonn

AUTHOR

Patrick De Geest, Apr 15 2001.

STATUS

approved

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Last modified February 17 17:27 EST 2018. Contains 299296 sequences. (Running on oeis4.)