

A089018


Smallest prime dividing the composite number consisting of A089017(n) successive 3's followed by a terminal 1.


3



17, 673, 307, 19, 523, 607, 181, 199, 31, 1009, 29, 23, 177943, 61, 312929, 17, 821, 353, 363941, 829, 19, 686269, 31, 1019, 2761379, 145501, 1397023, 28529353, 47, 2543, 17, 439, 23, 59, 70717063, 15683, 31, 19, 4555681103, 10616546557, 28759, 83
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..42.
Factordb, (10^n7)/3
Makoto Kamada, Factorizations of 33...331


PROG

(PARI) do(lim)=my(v=List()); for(n=9, lim+1, if(ispseudoprime(10^n\32), next); forprime(p=7, , if(Mod(10, p)^n==7, listput(v, p); next(2)))); Vec(v) \\ tests numbers with A089017(n) <= m; Charles R Greathouse IV, Oct 23 2013


CROSSREFS

Sequence in context: A200907 A203170 A063941 * A118769 A009158 A012050
Adjacent sequences: A089015 A089016 A089017 * A089019 A089020 A089021


KEYWORD

base,nonn


AUTHOR

Lekraj Beedassy, Nov 04 2003


EXTENSIONS

More terms from Ray Chandler, Nov 04 2003


STATUS

approved



