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A090276 Least number with identical digits such that the concatenation a(n) a(n-1) ...a(2)a(1) a(2) ... a(n-1) a(n) is a prime. +0
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2, 7, 3, 33, 9, 77, 33, 999, 1111111, 3, 33, 777777, 111111111, 77, 333333, 111, 99999999, 3333333333, 777777, 1, 33333333333333333333, 999999999999999999999999999999999999, 99999999, 999999999999999999999999999999999999999999, 3333333333333333333333333 (list; graph; listen)
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Last modified December 10 00:43 EST 2009. Contains 170568 sequences.


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