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17171...17171 (31-digits)
This number is a prime.
1 7171717171 7171717171 7171717171
Just showing those entries submitted by 'Silva': (Click here to show all)
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]
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