OFFSET
1,1
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
EXAMPLE
If n=17, then n11111111 = 1711111111 (prime).
If n=74, then n11111111 = 7411111111 (prime).
If n=128, then n11111111 = 12811111111 (prime).
MAPLE
select(n -> isprime(10^8*n+11111111), [$1..1000]); # Robert Israel, Feb 24 2017
MATHEMATICA
Select[Range[700], PrimeQ[#*10^8+11111111]&] (* Harvey P. Dale, Sep 25 2015 *)
PROG
(Magma) [ n: n in [1..700] | IsPrime(Seqint([1, 1, 1, 1, 1, 1, 1, 1] cat Intseq(n))) ]; // Vincenzo Librandi, Feb 03 2011
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Parthasarathy Nambi, Feb 26 2005
STATUS
approved