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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A020152 Pseudoprimes to base 24. 1
 25, 115, 175, 325, 553, 575, 805, 949, 1105, 1541, 1729, 1771, 1825, 1975, 2413, 2425, 2465, 2701, 2737, 2821, 2885, 3781, 4207, 4537, 6601, 6931, 6943, 7081, 7189, 7471, 7501, 7813, 8725, 8911, 9085, 9361, 9809, 10465, 10585, 11557, 12025, 13825, 14425 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Composite numbers n such that 24^(n-1) == 1 (mod n). - Michel Lagneau, Feb 18 2012 LINKS T. D. Noe, Table of n, a(n) for n = 1..1000 Index entries for sequences related to pseudoprimes MATHEMATICA base = 24; t = {}; n = 1; While[Length[t] < 100, n++; If[! PrimeQ[n] && PowerMod[base, n-1, n] == 1, AppendTo[t, n]]]; t (* T. D. Noe, Feb 21 2012 *) Select[Range[15000], CompositeQ[#]&&PowerMod[24, #-1, #]==1&] (* Harvey P. Dale, Jun 30 2023 *) CROSSREFS Cf. A001567 (pseudoprimes to base 2). Sequence in context: A050589 A340123 A247683 * A218493 A360511 A124953 Adjacent sequences: A020149 A020150 A020151 * A020153 A020154 A020155 KEYWORD nonn AUTHOR David W. Wilson 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 April 22 14:33 EDT 2024. Contains 371905 sequences. (Running on oeis4.)