A103964 Record values in A040076.

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

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: A187026 A179221 A350119 * 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