OFFSET
1,3
COMMENTS
The subsequence of primes p such that 4p+3 is a palindromic prime begins: 2, 37, 47, 181, 229, 3457.
EXAMPLE
a(1) = 2 because 4*2 + 3 = 11, and R(11) = 11 is prime.
a(2) = 37 because 4*37 + 3 = 151 is prime, and R(151) = 151.
MATHEMATICA
ppQ[n_]:=Module[{c=4n+3, d}, d=IntegerDigits[c]; PrimeQ[c]&&d == Reverse[ d]]; Select[Range[0, 20000], ppQ] (* Harvey P. Dale, Aug 02 2011 *)
CROSSREFS
KEYWORD
nonn,easy,base
AUTHOR
Jonathan Vos Post, Jul 26 2011
STATUS
approved