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A129911 Primes in A129910. 0

%I

%S 17,1447,2053,34367,50383,94427,140473,154487,190523,220553,286619,

%T 4303763,4763809,6443977,8504183,9044237,11304463,13404673,15504883,

%U 17005033,18145147,18345167,19605293,21205453,22345567,22605593

%N Primes in A129910.

%t a = {51}; For[n = 3, n < 500, n++, If[Prime[n + 1] == Prime[n] + 2, AppendTo[a, FromDigits[Join[IntegerDigits[Prime[n + 1]], IntegerDigits[Prime[n]]]]]]]; Select[a/3, PrimeQ[ # ] &]

%o (PARI) concattwins3r(n) = { local(x,y); forprime(x=2,n, if(isprime(x+2), y=floor(eval(concat(Str(x+2), Str(x)))/3); print1(y",") ) ) }

%K nonn,less

%O 1,1

%A _Cino Hilliard_, Jun 05 2007

%E Edited and extended by _Stefan Steinerberger_, Aug 02 2007

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Last modified July 23 21:10 EDT 2021. Contains 346265 sequences. (Running on oeis4.)