

A064699


Integers for which the smallest m in A040076 such that n*2^m+1 is prime (A050921) increases.


7



1, 3, 7, 17, 19, 31, 47, 383, 2897, 3061, 4847, 5359, 10223
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OFFSET

1,2


COMMENTS

Where records occur in A040076. A103964 gives the record values.


LINKS

Table of n, a(n) for n=1..13.


MATHEMATICA

a = 1; Do[m = 0; While[ !PrimeQ[n*2^m + 1], m++ ]; If[m > a, a = m; Print[n]], {n, 1, 10^3} ]


CROSSREFS

Cf. A040076, A050921.
Sequence in context: A140863 A076194 A167168 * A113304 A194945 A093651
Adjacent sequences: A064696 A064697 A064698 * A064700 A064701 A064702


KEYWORD

more,nonn


AUTHOR

Robert G. Wilson v, Oct 16 2001


EXTENSIONS

Corrected and extended by T. D. Noe, Nov 15 2010
a(13) was found by PrimeGrid, added by Arkadiusz Wesolowski, Feb 13 2017


STATUS

approved



