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A160405
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Primes that are the concatenation of a 5-digit prime, a 7-digit prime, and a 5-digit prime.
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0
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10007100000310037, 10007100000310163, 10007100000310247, 10007100000310271, 10007100000310289, 10007100000310321, 10007100000310433, 10007100000310463, 10007100000310477
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OFFSET
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1,1
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COMMENTS
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Haiku-haiku-haiku primes. I would like to call these "Haiku primes" but it seems that name has been used by Geoffrey Caveney for a different concept. Another possible name would be haiku-formed primes, but maybe that should be reserved for primes which are formed from any number of primes of width 5 or 7. Note that if you associate the hyphens with the central word, Haiku-haiku-haiku is itself of the 5-7-5 form (in characters).
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LINKS
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EXAMPLE
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10007, 1000003, 10037, and 10007100000310037 are all prime, so 10007100000310037 is in the sequence.
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PROG
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(Magma) [ a: p in PrimesInInterval(10000, 10007), q in PrimesInInterval(1000000, 1000003), r in PrimesInInterval(10000, 12000) | IsPrime(a) where a is Seqint(Intseq(r) cat Intseq(q) cat Intseq(p)) ]; // Klaus Brockhaus, May 20 2009
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CROSSREFS
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KEYWORD
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base,fini,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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