The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A130326 Least prime p such that 3*p*2^n+1 is prime. 3
 2, 2, 3, 3, 2, 2, 3, 2, 19, 5, 5, 2, 5, 11, 3, 47, 7, 2, 11, 19, 47, 11, 11, 59, 97, 11, 23, 5, 11, 2, 31, 13, 37, 3, 53, 2, 71, 5, 5, 97, 2, 7, 3, 3, 5, 167, 41, 37, 5, 163, 23, 73, 31, 17, 59, 19, 29, 41, 73, 43, 59, 47, 71, 3, 109, 2, 11, 3, 79, 41, 13 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Pierre CAMI, Table of n, a(n) for n = 0..500 EXAMPLE 3*2*2^0+1=7 prime so for n=0 p=2 3*2*2^1+1=13 prime so for n=1 p=2 MATHEMATICA nn=100; Flatten[Module[{prs=Prime[Range[nn]], c}, Table[c=2^n; Select[prs, PrimeQ[ 3c #+1]&, 1], {n, 0, nn}]]] (* Harvey P. Dale, Sep 01 2013 *) CROSSREFS Cf. A130325, A130327. Sequence in context: A213202 A234972 A367007 * A059906 A349196 A112046 Adjacent sequences: A130323 A130324 A130325 * A130327 A130328 A130329 KEYWORD nonn AUTHOR Pierre CAMI, May 24 2007 EXTENSIONS More terms from Harvey P. Dale, Sep 01 2013 STATUS approved

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

Last modified February 22 07:54 EST 2024. Contains 370240 sequences. (Running on oeis4.)