OFFSET
1,1
COMMENTS
All terms are odd and not multiples of 5. - Zak Seidov, Oct 29 2014
LINKS
Zak Seidov, Table of n, a(n) for n = 1..10000
EXAMPLE
n=3 is in the sequence because n1n = 313 is prime.
n=41 is in the sequence because n1n = 41141 is prime.
n=89 is in the sequence because n1n = 89189 is prime.
MATHEMATICA
Reap[Do[If[Mod[n, 5]>0&&PrimeQ[ToExpression[ToString[n]<>"1"<>ToString[n]]], Sow[n]], {n, 3, 1000, 2}]][[2, 1]] (* Zak Seidov, Oct 29 2014 *)
PROG
(Magma) [ n: n in [0..800] | IsPrime(Seqint(Intseq(n) cat [1] cat Intseq(n))) ]; // Klaus Brockhaus, Feb 03 2011
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Parthasarathy Nambi, Mar 30 2005
STATUS
approved