A194600 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

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