

A179538


Numbers 2n+1 for which A003558(n), n>=1, are record values of A003558.


1



3, 5, 7, 11, 13, 19, 23, 29, 37, 47, 53, 59, 61, 67, 71, 79, 83, 101, 103, 107, 121, 131, 139, 149, 163, 167, 173, 179, 181, 191, 197, 199, 211, 227, 239, 263, 269, 271, 293, 311, 317, 347, 349, 359, 367, 373, 379, 383, 389, 419, 421, 443, 461, 463, 467, 479
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OFFSET

1,1


COMMENTS

Conjecture. All terms are primes except for a finite set of squares of primes.
All terms from a(1) to a(5000) are primes except for a(21) = 121 = 11^2, supporting V. Shevelev's conjecture. [John W. Layman, Jul 22 2010]


LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000


MATHEMATICA

s = {}; am = 0; Do[a = Min[MultiplicativeOrder[2, n, {1, 1}]]; If[a > am, am = a; AppendTo[s, n]], {n, 3, 480, 2}]; s (* Amiram Eldar, Sep 13 2019 *)


CROSSREFS

Cf. A003558, A139099, A179383, A179481.
Sequence in context: A191377 A095070 A079733 * A216371 A095747 A132779
Adjacent sequences: A179535 A179536 A179537 * A179539 A179540 A179541


KEYWORD

nonn


AUTHOR

Vladimir Shevelev, Jul 18 2010


EXTENSIONS

a(31)a(56) from John W. Layman, Jul 22 2010


STATUS

approved



