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A101251
Primes that are a concatenation of 2, 3, 5 and a prime.
6
2357, 23531, 23537, 23561, 23567, 235181, 235199, 235211, 235241, 235307, 235337, 235349, 235397, 235439, 235523, 235541, 235577, 235601, 235607, 235661, 235673, 235751, 235787, 235811, 235877, 235919, 235967, 235997, 2351033, 2351171
OFFSET
1,1
LINKS
EXAMPLE
2357 is a prime of order four since it is concatenated from the primes 2,3,5 and 7.
MATHEMATICA
Select[ Table[ FromDigits[ Flatten[ IntegerDigits /@ {2, 3, 5, Prime[n]}]], {n, 200}], PrimeQ[ # ] &] (* Robert G. Wilson v, Dec 20 2004 *)
CROSSREFS
KEYWORD
nonn,easy,base
AUTHOR
Parthasarathy Nambi, Dec 16 2004
EXTENSIONS
Extended by Ray Chandler and Robert G. Wilson v, Dec 22 2004
STATUS
approved