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A088090
For n > 1, a(n) is the smallest number such that n-th concatenation is prime and the smallest palindrome beginning with (but not equal to) this concatenation is also prime.
0
1, 3, 9, 13, 17, 271, 671, 489, 193, 819, 2219, 5719, 5753, 2391, 20089, 3059, 231, 8259, 16719, 18493, 37967, 16197, 8979, 28153, 11583, 10073, 14169, 57589, 85073, 79053, 121009, 148997, 69921, 42033, 12027, 16437, 20743, 57363, 240183, 88689
OFFSET
1,2
COMMENTS
Conjecture: sequence is finite.
EXAMPLE
11, (13 and 131), (139, 13931), (13913 and 139131931), etc. are all prime.
CROSSREFS
Sequence in context: A363406 A240108 A163595 * A075326 A298870 A095234
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Sep 23 2003
EXTENSIONS
More terms from David Wasserman, Jul 15 2005
STATUS
approved