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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. 0
3, 7, 17, 10181, 1753, 30977, 1507853 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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

LINKS

Table of n, a(n) for n=1..7.

CROSSREFS

Cf. A000040, A065091, A073501.

Sequence in context: A041949 A222452 A218165 * A331713 A327321 A069143

Adjacent sequences:  A102326 A102327 A102328 * A102330 A102331 A102332

KEYWORD

nonn

AUTHOR

Labos Elemer, Jan 05 2005

EXTENSIONS

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

STATUS

approved

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Last modified September 17 19:58 EDT 2021. Contains 347489 sequences. (Running on oeis4.)