A007324 Least number for which Solovay-Strassen primality test on bases < prime(n) fails. (Formerly M5443)

9, 561, 1729, 1729, 399001, 399001, 1857241, 1857241, 6189121, 14469841, 14469841, 14469841

Offset

1,1

References

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=1..12.

Wikipedia, Solovay-Strassen primality test

Prog

(PARI) a(n) = my(b, p=factorback(primes(n-1))); forcomposite(k=9, oo, if(gcd(k, p)==1, b=2; while(Mod(b, k)^(k\2) == kronecker(b, k), b++); if(b>=prime(n), return(k)))); \\ Jinyuan Wang, Jun 04 2022

Crossrefs

Cf. A083876, A271221, A329726.

Sequence in context: A357229 A267548 A326614 * A354692 A347844 A291910

Adjacent sequences: A007321 A007322 A007323 * A007325 A007326 A007327

Keyword

nonn,more

Author

N. J. A. Sloane, Eric Bach (bach(AT)cs.wisc.edu)

Extensions

Offset changed to 1 and a(1) corrected by Jinyuan Wang, Jun 04 2022

Status

approved