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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A302123 Numbers k such that 6*k^k - 5 is prime. 6
 2, 3, 4, 7, 8, 9, 33, 138, 251, 467, 489, 9894 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(13) > 50000. - Robert Price, Jan 04 2020 LINKS Table of n, a(n) for n=1..12. MATHEMATICA Select[Range[1, 1000], PrimeQ[6*#^# - 5] &] (* Vaclav Kotesovec, Apr 02 2018 *) PROG (PARI) for(n=0, 300, if(isprime(6*n^n-5), print1(n", "))) CROSSREFS Numbers k such that b*k^k - b + 1 is prime: A301521 (b=4), this sequence (b=6). Cf. A302090, A302124. Sequence in context: A111116 A113318 A056033 * A286337 A047547 A014456 Adjacent sequences: A302120 A302121 A302122 * A302124 A302125 A302126 KEYWORD nonn,more,hard AUTHOR Seiichi Manyama, Apr 01 2018 EXTENSIONS a(10)-a(11) from Vaclav Kotesovec, Apr 02 2018 a(12) from Robert Price, Jan 04 2020 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 July 19 21:43 EDT 2024. Contains 374437 sequences. (Running on oeis4.)