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A030459
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Prime p concatenated with next prime is also prime.
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25
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2, 31, 83, 151, 157, 167, 199, 233, 251, 257, 263, 271, 331, 353, 373, 433, 467, 509, 523, 541, 601, 653, 661, 677, 727, 941, 971, 1013, 1033, 1181, 1187, 1201, 1223, 1259, 1367, 1453, 1459, 1657, 1669, 1709, 1741, 1861, 1973, 2069, 2161
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OFFSET
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1,1
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COMMENTS
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All terms, except for the first one, must be either in A185934 or in A185935, i.e., have the same residue (mod 6) as the subsequent prime. - M. F. Hasler, Feb 06 2011
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LINKS
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FORMULA
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MATHEMATICA
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Select[Prime[Range[500]], PrimeQ[FromDigits[Join[IntegerDigits[#], IntegerDigits[ NextPrime[#]]]]]&] (* Harvey P. Dale, Jun 20 2011 *)
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PROG
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(PARI) o=2; forprime(p=3, 1e4, isprime(eval(Str(o, o=p))) & print1(precprime(p-1)", ")) \\ M. F. Hasler, Feb 06 2011
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CROSSREFS
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See A030461 for the concatenated primes.
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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