

A178433


Numbers n such that 10^n  63 is prime.


0



2, 3, 7, 9, 12, 16, 33, 78, 124, 334, 3618, 3682, 3739, 4732, 6676, 16014, 20023, 20364, 66793
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OFFSET

1,1


COMMENTS

The next term, if it exists, is > 100000.
See Kamada link  primecount.txt for terms, primesize.txt for discovery details including probable or proved primes  search on "99937".


LINKS

Table of n, a(n) for n=1..19.
Makoto Kamada, List of nearrepdigitrelated prime numbers.
Index entries for primes involving repunits.


EXAMPLE

10^3  63 = 937 which is a prime number.


MATHEMATICA

nMax=1000; Do[If[PrimeQ[10^n63], Print[n]], {n, nMax}]


PROG

(PARI) is(n)=ispseudoprime(10^n63) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Cf. A108330, A108328.
Sequence in context: A262814 A260641 A077510 * A073148 A014839 A262775
Adjacent sequences: A178430 A178431 A178432 * A178434 A178435 A178436


KEYWORD

more,nonn


AUTHOR

Robert Price, Dec 21 2010


EXTENSIONS

a(19)=66793 from Robert Price, May 29 2011


STATUS

approved



