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A165292 Primes obtained from other primes by pre-concatenating with 3. 6

%I

%S 37,311,313,317,331,337,347,353,359,367,373,379,383,389,397,3109,3137,

%T 3163,3167,3181,3191,3229,3251,3257,3271,3307,3313,3331,3347,3359,

%U 3373,3389,3433,3449,3457,3461,3463,3467,3491,3499,3541,3547,3557,3571,3593

%N Primes obtained from other primes by pre-concatenating with 3.

%C The primes are considered in increasing order. These primes are obtained by adding 30, 300, 3000, ... to other primes.

%H Chris Caldwell, <a href="http://primes.utm.edu/lists/small/10000.txt">The First 10,000 Primes</a>

%e The prime 3389 is obtained from the prime 389 by pre-concatenating with 3.

%t Select[(FromDigits[Join[{3},IntegerDigits[#]]]&/@Prime[Range[200]]),PrimeQ] (* _Harvey P. Dale_, Mar 04 2011 *)

%Y Cf. A000040, A165243

%K base,nonn

%O 1,1

%A _Parthasarathy Nambi_, Sep 13 2009

%E 359 inserted by _R. J. Mathar_, Sep 21 2009

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Last modified June 2 07:15 EDT 2020. Contains 334767 sequences. (Running on oeis4.)