

A103964


Record values in A040076.


7



0, 1, 2, 3, 6, 8, 583, 6393, 9715, 33288, 3321063, 5054502, 31172165
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OFFSET

1,3


COMMENTS

The index sequence of this sequence is 1, 3, 7, 17, 19, 31, 47, 383, 2897. A040076(2897)>8192, not yet found.
A064699 gives where the records occur.


LINKS

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


EXAMPLE

A040076(1)=0, so a(1)=0;
A040076(3)=1, so a(2)=1;


MATHEMATICA

k = 1; n = 0; km = k; While[k < 8192, n++; k = 0; cp = n*(2^ k) + 1; While[(! PrimeQ[cp]) && (k < 8192), k++; cp = n*(2^k) + 1]; If[k > km, km = k; Print[{n, km}]]]


CROSSREFS

Cf. A040076, A103963.
Sequence in context: A224211 A187026 A179221 * A199790 A088329 A193079
Adjacent sequences: A103961 A103962 A103963 * A103965 A103966 A103967


KEYWORD

nonn,more


AUTHOR

Lei Zhou, Feb 24 2005


EXTENSIONS

Extended by T. D. Noe, Nov 15 2010
a(13) was found by PrimeGrid, added by Richard N. Smith, Jul 15 2019


STATUS

approved



