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Primes that are a concatenation of 3, 5 and a prime.
6

%I #8 Jan 23 2019 16:09:51

%S 353,3511,3517,3529,3541,3547,3559,3571,3583,35107,35149,35227,35251,

%T 35257,35281,35311,35317,35353,35401,35419,35449,35461,35491,35509,

%U 35521,35569,35593,35617,35677,35797,35809,35839,35863,35911,35977

%N Primes that are a concatenation of 3, 5 and a prime.

%H Harvey P. Dale, <a href="/A101219/b101219.txt">Table of n, a(n) for n = 1..1000</a>

%H Peter Alfeld <a href="http://www.math.utah.edu/~alfeld/math/p10000.html">The 10,000 smallest prime numbers</a>.

%e 3511 is a prime concatenated from the primes 3, 5 and 11.

%t Select[35*10^IntegerLength[#]+#&/@Prime[Range[200]],PrimeQ] (* _Harvey P. Dale_, Jan 23 2019 *)

%Y Cf. A100607, A101218, A101249, A101250, A101251, A101252.

%K nonn,base,easy

%O 1,1

%A _Parthasarathy Nambi_, Dec 14 2004

%E Extended by _Ray Chandler_, Dec 22, 2004