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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
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
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jan 05 2005
EXTENSIONS
a(7)=1507853 from Ray Chandler, Jan 08 2005
STATUS
approved