A179538 Numbers 2n+1 for which A003558(n), n>=1, are record values of A003558.

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

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: A095070 A350577 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