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A165292 Primes obtained from other primes by pre-concatenating 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 (list; graph; refs; listen; history; text; internal format)
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 pre-concatenating 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

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Last modified April 6 21:24 EDT 2020. Contains 333286 sequences. (Running on oeis4.)