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A099749
The number defined by the decimal string "a(2n) 1's followed by a(2n+1)" is prime.
0
1, 1, 1, 3, 1, 7, 1, 9, 2, 3, 3, 7, 4, 3, 4, 7, 4, 9, 5, 9, 7, 7, 7, 9, 8, 3, 10, 3, 16, 9, 18, 1, 22, 1, 22, 7, 23, 3, 28, 7, 39, 7, 49, 9, 83, 3, 130, 7, 135, 7, 214, 7, 220, 3, 316, 1, 610, 7, 683, 9, 719, 9, 766, 7, 1030, 1, 1313, 3, 1451, 9, 1678, 9, 2152, 7, 2575, 7
OFFSET
0,4
EXAMPLE
The numbers 11, 13, 17, 19, 113, 1117, 11113, 11117, 11119, 111119, ... are primes.
CROSSREFS
Sequence in context: A277934 A063754 A163117 * A210442 A077202 A086665
KEYWORD
base,nonn
AUTHOR
Pierre CAMI, Nov 10 2004
EXTENSIONS
Edited by Don Reble, Nov 07 2005
STATUS
approved