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A165292
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Primes obtained from other primes by pre-concatenating with 3.
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6
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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
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1,1
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COMMENTS
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The primes are considered in increasing order. These primes are obtained by adding 30, 300, 3000, ... to other primes.
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LINKS
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EXAMPLE
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The prime 3389 is obtained from the prime 389 by pre-concatenating with 3.
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MATHEMATICA
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Select[(FromDigits[Join[{3}, IntegerDigits[#]]]&/@Prime[Range[200]]), PrimeQ] (* Harvey P. Dale, Mar 04 2011 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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