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

37, 311, 313, 317, 331, 337, 347, 353, 359, 367, 373, 379, 383, 389, 397, 3109, 3137, 3163, 3167, 3181, 3191, 3229, 3251, 3257, 3271, 3307, 3313, 3331, 3347, 3359, 3373, 3389, 3433, 3449, 3457, 3461, 3463, 3467, 3491, 3499, 3541, 3547, 3557, 3571, 3593

Offset: 1

Author

Parthasarathy Nambi, Sep 13 2009

Keywords

• base
• nonn

Comments

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

Examples

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

Links

• Chris Caldwell, The First 10,000 Primes

Crossrefs

Cf. A000040, A165243

Programs

Mathematica

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

Extensions

359 inserted by R. J. Mathar, Sep 21 2009