The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A214730 Smallest prime q such that 9^n + q*3^n - 1 is prime. 2
 3, 3, 3, 3, 13, 19, 43, 3, 61, 13, 29, 11, 5, 53, 73, 53, 23, 17, 229, 13, 3, 3, 17, 149, 5, 239, 5, 13, 223, 71, 3, 11, 31, 73, 97, 43, 11, 83, 149, 277, 311, 383, 127, 11, 3, 31, 233, 61, 61, 13, 73, 107, 613, 137, 53, 367, 467, 53, 233, 277, 17, 53, 109, 449, 151, 97, 13, 281, 103, 233, 193, 23, 7 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Pierre CAMI, Table of n, a(n) for n = 1..4000 PROG (PFGW and SCRIPTIFY) SCRIPT DIM nn, 0 DIM qq DIMS tt OPENFILEOUT myfile, a(n).txt LABEL loopn SET nn, nn+1 IF nn>4000 THEN END SET qq, 1 LABEL loopq SET qq, qq+1 SETS tt, %d, %d\,; nn; p(qq) PRP (3^nn+p(qq))*3^nn-1, tt IF ISPRP THEN GOTO a IF ISPRIME THEN GOTO a GOTO loopk LABEL a WRITE myfile, tt GOTO loopn CROSSREFS Cf. A214700. Sequence in context: A170858 A024725 A269562 * A153491 A287505 A288124 Adjacent sequences:  A214727 A214728 A214729 * A214731 A214732 A214733 KEYWORD nonn AUTHOR Pierre CAMI, Jul 27 2012 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.

Last modified February 19 19:30 EST 2020. Contains 332047 sequences. (Running on oeis4.)