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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A093765 Numbers n such that 6^n+5^(n-1) is prime. 16
 1, 2, 3, 8, 9, 15, 26, 30, 69, 212, 318, 909, 1224, 1946, 2192, 2234, 2978, 3344, 4976, 7947, 8079, 23334, 23624, 55401, 89712 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(26) > 10^5. - Robert Price, Feb 13 2016 LINKS Table of n, a(n) for n=1..25. EXAMPLE 15 is a member since 615+515 = 476288500201 which is a prime number. MATHEMATICA Do[ If[ PrimeQ[6^n + 5^(n - 1)], Print[n]], {n, 4000] PROG (PARI) is(n)=isprime(6^n+5^(n-1)) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A093713, A082103, A093717, A093793, A096185, A093794, A093795, A096186. Sequence in context: A051209 A332481 A331821 * A260020 A104577 A372824 Adjacent sequences: A093762 A093763 A093764 * A093766 A093767 A093768 KEYWORD nonn AUTHOR Herman H. Rosenfeld (herm3(AT)pacbell.net), May 17 2004 EXTENSIONS More terms from Robert G. Wilson v, Jun 18 2004 a(19)-a(25) from Robert Price, Feb 13 2016 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 17 10:44 EDT 2024. Contains 374377 sequences. (Running on oeis4.)