The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A112745 Least k such that 6*k*prime(n)^2 +1 is prime, where prime(i)=i-th prime. 2
 3, 2, 1, 3, 1, 2, 2, 5, 4, 2, 3, 8, 2, 2, 4, 7, 1, 8, 3, 2, 2, 1, 13, 1, 2, 10, 5, 3, 1, 4, 2, 1, 9, 3, 5, 2, 14, 3, 9, 3, 3, 10, 1, 5, 4, 1, 2, 2, 2, 6, 3, 2, 1, 10, 5, 7, 1, 3, 10, 6, 2, 7, 7, 8, 5, 3, 3, 3, 2, 6, 12, 1, 2, 3, 12, 4, 1, 3, 5, 6, 2, 2, 1, 3, 1, 3, 3, 4, 2, 14, 7, 26, 9, 2, 12, 3, 5, 5, 7, 6 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..100. MATHEMATICA Table[k = 1; While[ ! PrimeQ[6*k*Prime[n]^2 + 1], k++ ]; k, {n, 100}] (* Ray Chandler, Oct 08 2005 *) CROSSREFS Cf. A112744, A112746. Sequence in context: A265027 A079587 A237881 * A205564 A036585 A260454 Adjacent sequences: A112742 A112743 A112744 * A112746 A112747 A112748 KEYWORD nonn AUTHOR Pierre CAMI, Sep 18 2005 EXTENSIONS Extended by Ray Chandler, Oct 08 2005 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 June 17 03:50 EDT 2024. Contains 373432 sequences. (Running on oeis4.)