%I #16 Dec 14 2018 19:44:25

%S 2,3,5,7,11,13,17,31,71,73,101,107,113,131,149,157,167,179,181,191,

%T 199,311,347,353,359,389,701,733,739,743,751,761,787,797,919,941,953,

%U 967,971,983,991,1009,1021,1031,1061,1091,1097,1103,1109,1151,1153,1217,1223

%N Primes p whose reversal is a Chen prime.

%C 73 is the smallest non-Chen prime whose reversal is a Chen prime.

%e 73 is in the sequence because its reversal is 37 which is a Chen prime (because 37 + 2 = 39 has at most two prime factors).

%t cpQ[n_] := Module[{rev = FromDigits[Reverse[IntegerDigits[n]]]}, PrimeQ[rev] && PrimeOmega[rev + 2] < 3]; Select[Prime[Range[400]], cpQ] (* _Amiram Eldar_, Nov 09 2018 after _Harvey P. Dale_ at A118725 *)

%o (PARI) is(n) = if(isprime(n), rn = fromdigits(Vecrev(digits(n))); return(isprime(rn) && bigomega(rn+2) <= 2), 0) \\ _David A. Corneth_, Nov 09 2018

%Y Cf. A118725, A109611, A102540.

%K nonn,base

%O 1,1

%A _Paolo Galliani_, Nov 09 2018