A194600 Record values in A194591.

0, 1, 2, 4, 5, 6, 11, 18, 20, 28, 70, 106, 208, 726, 910, 2906, 7431, 14073, 22394, 41422, 82587, 85461, 356981

Offset

1,3

Comments

Indices of records are given by A217892.

References

Wilfrid Keller, personal communication, 2010.

Links

Table of n, a(n) for n=1..23.

Chris K. Caldwell, The List of Largest Known Primes, 1355477231 * 2^356981 + 1

Carlos Rivera, Problem 30

Example

A194591(59) = 5 since A194591(109) = 6 is the next record value.

Mathematica

l = -1; Flatten[Table[k = 0; While[! PrimeQ[n*2^k - 1] && ! PrimeQ[n*2^k + 1], k++]; If[k > l, l = k, {}], {n, 10^5}]] (* Arkadiusz Wesolowski, Sep 04 2011 *)

Crossrefs

Cf. A194591, A194603, A194606, A194607, A194608, A194635, A194636, A194637, A194638, A194639.

Cf. A103963, A103964, A076335, A180247.

Sequence in context: A171166 A194607 A194637 * A255543 A256458 A376702

Adjacent sequences: A194597 A194598 A194599 * A194601 A194602 A194603

Keyword

more,nonn

Author

Arkadiusz Wesolowski, Aug 30 2011

Extensions

a(23)=A194637(22) from Wilfrid Keller, added by Max Alekseyev, Oct 18 2014

Status

approved