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.

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A102329 a(n) is the least prime p such that the largest prime divisor of 1+p^n is less than p.

Original entry on oeis.org

3, 7, 17, 10181, 1753, 30977, 1507853
Offset: 1

Views

Author

Labos Elemer, Jan 05 2005

Keywords

Comments

First term of sequences A065091, A073501, A102325-A102328.
These are the smallest p primes such that 1+p^n are p-smooth, i.e. with all prime-divisors less than p. The same holds for A102325-A102328. For the majority of p's, 1+p^n appear to be not p-smooth, i.e. have large enough greatest prime divisors.
a(8) > 4.5*10^6. - Giovanni Resta, May 02 2017

Crossrefs

Cf. A000040, A065091, A073501.

Extensions

a(7)=1507853 from Ray Chandler, Jan 08 2005
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