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

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A250199 Smallest pseudoprime (>prime(n)) to base prime(n). 2
 341, 91, 124, 25, 15, 21, 45, 45, 33, 35, 49, 45, 105, 77, 65, 65, 87, 91, 85, 105, 111, 91, 105, 99, 105, 175, 133, 133, 117, 133, 153, 143, 148, 161, 175, 175, 186, 186, 231, 205, 185, 195, 217, 276, 231, 225, 217, 231, 285, 285, 259, 255, 363, 289, 301, 341, 286, 341, 322, 329 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Subsequence of A007535, see formula. LINKS Eric Chen, Table of n, a(n) for n = 1..4096 FORMULA a(n) = A007535(A000040(n)). EXAMPLE a(7) = 45 because the 7th prime is 17, and the smallest pseudoprime (> 17) to base 17 is 45. MATHEMATICA f[n_] := Block[{b = Prime[n], k = Prime[n] + 1}, While[PrimeQ[k] || PowerMod[b, k - 1, k] != 1, k++]; k]; Array[f, 60] PROG a(n) = for(k=prime(n)+1, 2^24, if(Mod(prime(n), k)^(k-1)==Mod(1, k) && !isprime(k), return(k))) CROSSREFS Cf. A007535, A090086, A108162, A098650. Sequence in context: A057598 A271801 A322120 * A271874 A025335 A025327 Adjacent sequences:  A250196 A250197 A250198 * A250200 A250201 A250202 KEYWORD nonn AUTHOR Eric Chen, Feb 21 2015 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 January 17 10:57 EST 2021. Contains 340221 sequences. (Running on oeis4.)