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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 (list; graph; refs; listen; history; text; internal format)
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
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
Sequence in context: A095070 A350577 A079733 * A216371 A095747 A132779
KEYWORD
nonn
AUTHOR
Vladimir Shevelev, Jul 18 2010
EXTENSIONS
a(31)-a(56) from John W. Layman, Jul 22 2010
STATUS
approved

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Last modified March 29 08:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)