

A178430


Numbers n such that 10^n  53 is prime.


0



2, 3, 11, 15, 23, 29, 44, 71, 83, 95, 159, 383, 404, 548, 633, 6409, 8793, 24146, 25727, 64436, 74335, 76875
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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 "99947".


LINKS

Table of n, a(n) for n=1..22.
Makoto Kamada, List of nearrepdigitrelated prime numbers.
Index entries for primes involving repunits.


EXAMPLE

10^3  53 = 947 which is a prime number.


MATHEMATICA

m=1000; For[n=1, n<m, If[PrimeQ[10^n53], Print[n]]; n++ ]


PROG

(PARI) is(n)=ispseudoprime(10^n53) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Cf. A108330, A108328.
Sequence in context: A042235 A050587 A293026 * A295128 A066687 A144979
Adjacent sequences: A178427 A178428 A178429 * A178431 A178432 A178433


KEYWORD

more,nonn


AUTHOR

Robert Price, Dec 21 2010


EXTENSIONS

Corrected terms a(17) and a(18) by Robert Price, Dec 24 2010
a(2022)=64436,74335,76875 from Robert Price, May 29 2011


STATUS

approved



