cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A354694 Least Euler pseudoprime to base 2 through base prime(n).

Original entry on oeis.org

341, 1729, 1729, 46657, 46657, 162401, 399001, 399001, 399001, 399001, 488881, 3057601, 3057601, 3828001, 3828001, 3828001, 3828001, 3828001, 3828001, 3828001, 3828001, 3828001, 3828001, 3828001, 3828001, 17098369, 17098369, 17098369, 17098369, 17236801, 17236801
Offset: 1

Views

Author

Jinyuan Wang, Jun 04 2022

Keywords

Comments

a(n) is coprime to A002110(n).

Crossrefs

Programs

  • PARI
    a(n) = my(b, m, p=factorback(primes(n))); forcomposite(k=9, oo, if(gcd(k, p)==1, b=2; while((m=Mod(b, k)^(k\2)) == 1 || m == k-1, b++); if(b>prime(n), return(k))));