OFFSET
1,1
EXAMPLE
If k=6, then k1111111 = 61111111 (prime).
If k=54, then k1111111 = 541111111 (prime).
If k=108, then k1111111 = 1081111111 (prime).
PROG
(Magma) [ n: n in [1..700] | IsPrime(Seqint([1, 1, 1, 1, 1, 1, 1] cat Intseq(n))) ]; // Vincenzo Librandi, Feb 04 2011
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Parthasarathy Nambi, Feb 25 2005
STATUS
approved