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Search: id:A160405
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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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| 10007100000310037, 10007100000310163, 10007100000310247, 10007100000310271, 10007100000310289, 10007100000310321, 10007100000310433, 10007100000310463, 10007100000310477
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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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 (rokirovka(AT)gmail.com) 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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Walter Nissen, Home Page (listed in lieu of email address)
Wikipedia, Haiku
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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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PROGRAM
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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)) ]; [From Klaus Brockhaus, May 20 2009]
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CROSSREFS
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Cf. A000040 (primes), A006879 (number of primes with n digits).
Sequence in context: A136607 A115227 A104836 this_sequence A162032 A141621 A098143
Adjacent sequences: A160402 A160403 A160404 this_sequence A160406 A160407 A160408
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KEYWORD
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base,fini,nonn
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AUTHOR
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Walter Nissen May 13 2009
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EXTENSIONS
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Edited by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), May 20 2009
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