login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A217892 Indices of records in A194591. 4
1, 5, 13, 47, 59, 109, 241, 335, 1109, 1373, 1447, 14893, 37892, 56543, 185644, 649603, 838441, 8840101, 16935761, 100604513, 118373279, 270704167, 1355477231 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Record values are given by A194600.

LINKS

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

MATHEMATICA

a[n_]:= (k=0; While[!PrimeQ[n*2^k-1] && !PrimeQ[n*2^k+1], k++]; k); w = {1}; v = {0}; Do[If[a[n]>v[[-1]], AppendTo[v, a[n]]; Print[n]], {n, 1356000000}] (* Farideh Firoozbakht, Oct 16 2014 *)

CROSSREFS

Cf. A194635, A194639

Sequence in context: A320877 A099972 A060050 * A194639 A152925 A304964

Adjacent sequences:  A217889 A217890 A217891 * A217893 A217894 A217895

KEYWORD

more,nonn

AUTHOR

Max Alekseyev, Oct 14 2012

EXTENSIONS

a(23)=A194639(22) from Wilfrid Keller, added by Max Alekseyev, Oct 18 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 21 08:47 EDT 2019. Contains 328292 sequences. (Running on oeis4.)