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A090478
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.
0
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
OFFSET
1,2
EXAMPLE
113, 3217, 1733 etc. are primes. 3217 is the prime obtained by placing 2 in the second gap.
CROSSREFS
Sequence in context: A285740 A174506 A109216 * A231785 A195421 A140446
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Dec 02 2003
EXTENSIONS
More terms from David Wasserman, Nov 16 2005
STATUS
approved