

A165292


Primes obtained from other primes by preconcatenating with 3.


6



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
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OFFSET

1,1


COMMENTS

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


LINKS

Table of n, a(n) for n=1..45.
Chris Caldwell, The First 10,000 Primes


EXAMPLE

The prime 3389 is obtained from the prime 389 by preconcatenating with 3.


MATHEMATICA

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


CROSSREFS

Cf. A000040, A165243
Sequence in context: A217642 A197340 A165373 * A114785 A061014 A130450
Adjacent sequences: A165289 A165290 A165291 * A165293 A165294 A165295


KEYWORD

base,nonn


AUTHOR

Parthasarathy Nambi, Sep 13 2009


EXTENSIONS

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


STATUS

approved



