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Search: id:A105435
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| A105435 |
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Primes which with a 1 prepended stay prime. |
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+0
2
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| 3, 7, 13, 31, 37, 67, 73, 79, 97, 103, 109, 151, 163, 181, 193, 223, 229, 277, 283, 307, 367, 373, 409, 433, 439, 487, 499, 523, 571, 601, 607, 613, 619, 709, 733, 787, 811, 823, 877, 907, 997, 1069, 1087, 1093, 1117, 1171, 1213, 1279, 1321, 1399, 1423, 1447
(list; graph; listen)
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OFFSET
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1,1
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MAPLE
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with(numtheory); for i from 1 to 500 do if isprime(10^(ceil(log[10](ithprime(i))))+ithprime(i)) then printf(`%d, `, ithprime(i)) fi: od: (Sellers)
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MATHEMATICA
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Select[ Prime[ Range[ 230]], PrimeQ[ FromDigits[ Join[{1}, IntegerDigits[ # ]]]] &] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 09 2005)
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CROSSREFS
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Cf. A023237.
Adjacent sequences: A105432 A105433 A105434 this_sequence A105436 A105437 A105438
Sequence in context: A049488 A136051 A100750 this_sequence A117708 A093431 A083520
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KEYWORD
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nonn,base
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), Apr 08 2005
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EXTENSIONS
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Corrected and extended by Robert G. Wilson v (rgwv(AT)rgwv.com) and James A. Sellers (sellersj(AT)math.psu.edu), Apr 09 2005
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