OFFSET
1,1
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..270 (terms 1..77 from Vincenzo Librandi, terms 78..145 from Zak Seidov)
MATHEMATICA
d[n_]:=IntegerDigits[n]; ins[n_]:=FromDigits/@Table[Insert[d[n], 1, k], {k, Length[d[n]]+1}]; Select[Prime[Range[20000]], And@@PrimeQ/@ins[#] &] (* Jayanta Basu, May 20 2013 *)
PROG
(Magma) [p: p in PrimesUpTo(210000) | forall{m: t in [0..#Intseq(p)] | IsPrime(m) where m is (Floor(p/10^t)*10+1)*10^t+p mod 10^t}]; // Bruno Berselli, Sep 03 2012
CROSSREFS
KEYWORD
nonn,easy,base
AUTHOR
N. J. A. Sloane, Apr 14 2002
EXTENSIONS
More terms from Vladeta Jovovic, Apr 16 2002
STATUS
approved