17171...17171 (31-digits)
This number is a prime.
1 7171717171 7171717171 7171717171
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The smallest smoothly undulating palindromic prime (SUPP)
formed from digits 1 and 7. Curiously, the sum of its digits
is the smallest smoothly undulating palindromic composite. [Silva]
Submitted: 2010-01-29 11:41:16; Last Modified: 2010-01-29 12:58:31.
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