

A108049


Integers k such that 10^k + 43 is a prime number.


27




OFFSET

1,2


COMMENTS

a(8) > 10^5.  Robert Price, Nov 01 2013
See Kamada link  primecount.txt for terms, primesize.txt for discovery details including probable or proved primes  search on "10043".


LINKS

Table of n, a(n) for n=1..7.
Makoto Kamada, List of nearrepdigitrelated prime numbers.
Index entries for primes involving repunits.


EXAMPLE

k=5 is a term because 10^5 + 43 = 100043, which is prime.


MATHEMATICA

Select[Range[2*10^3], PrimeQ[10^#+43]&]  Vladimir Joseph Stephan Orlovsky, Apr 29 2008


PROG

(PARI) is(n)=ispseudoprime(10^n+43) \\ Charles R Greathouse IV, Apr 28 2015


CROSSREFS

Cf. A049054, A088274, A088275.
Sequence in context: A183385 A054417 A080507 * A121141 A331449 A220634
Adjacent sequences: A108046 A108047 A108048 * A108050 A108051 A108052


KEYWORD

nonn,more


AUTHOR

Julien Peter Benney (jpbenney(AT)ftml.net), Jun 01 2005


EXTENSIONS

a(7)=35393 from Robert Price, Mar 16 2010
Edited by Ray Chandler, Dec 23 2010


STATUS

approved



