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A090478
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a(1) = 1; for n>=1, a(n+1) is the least number such that the concatenation of a(n), n and a(n+1) is prime.
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0
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1, 3, 17, 3, 7, 1, 3, 3, 3, 7, 3, 9, 7, 17, 27, 17, 7, 7, 7, 3, 3, 7, 9, 9, 1, 9, 23, 9, 1, 1, 1, 9, 3, 1, 11, 1, 1, 3, 9, 1, 9, 3, 11, 7, 11, 47, 19, 1, 1, 3, 23, 11, 7, 7, 1, 3, 17, 3, 1, 7, 3, 3, 3, 1, 11, 7, 9, 7, 1, 3, 1, 17, 9, 3, 23, 3, 1, 7, 9, 1, 1, 1, 3, 3, 7, 3, 3, 7, 3, 17, 3, 1, 11, 3, 3, 11
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| 113, 3217, 1733 etc. are primes. 3217 is the prime obtained by placing 2 in the second gap.
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CROSSREFS
| Sequence in context: A140519 A174506 A109216 * A195421 A140446 A124689
Adjacent sequences: A090475 A090476 A090477 * A090479 A090480 A090481
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 02 2003
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Nov 16 2005
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