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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A247208 Common bases of 1093 and 3511 as generalized Wieferich primes. 4
 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 429327, 524288, 858654, 1048576, 1717308, 2097152, 3434616, 4194304, 6869232, 8388608, 13738464, 14583415, 16777216, 27476928, 29166830, 31995179, 33554432, 46455089, 54953856, 57420033, 58333660, 58473815 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Numbers b such that b^1092 == 1 (mod 1093^2) and b^3510 == 1 (mod 3511^2). Here 1093 and 3511 are the currently known Wieferich primes (A001220) and thus b = 2 belongs to this sequence by definition. Contains the powers of 2 (A000079) as a subsequence. Contains infinitely many primes, which are listed in A247214. The characteristic function is multiplicative: if x,y belong to this sequence, then so does x*y. Furthermore, if p^k belongs to this sequence, then so does p. Therefore, the sequence consists of products of powers of primes from A247214. Numbers b such that b^49140 == 1 (mod 1093^2*3511^2). - Jianing Song, Dec 26 2018 LINKS Table of n, a(n) for n=1..41. Wikipedia, Wieferich prime. FORMULA The union of 1092*3510 = 3832920 arithmetic progressions with the same difference 1093^2*3511^2 = 14726582775529. For any n, a(n+3832920) = a(n) + 14726582775529. PROG (PARI) r1=znprimroot(1093^2)^1093; r2=znprimroot(3511^2)^3511; v=vector(1092*3510); for(i=0, 1091, for(j=0, 3509, v[i*3510+j+1]=lift(chinese(r1^i, r2^j)) )); v=vecsort(v); vector(100, i, v[i]) CROSSREFS Cf. A001220. Sequence in context: A118655 A335891 A249169 * A325744 A034008 A123344 Adjacent sequences: A247205 A247206 A247207 * A247209 A247210 A247211 KEYWORD nonn AUTHOR Max Alekseyev, Nov 25 2014 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 August 7 06:05 EDT 2024. Contains 375008 sequences. (Running on oeis4.)