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A056730
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Palindromic primes with just two distinct digits.
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2
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101, 131, 151, 181, 191, 313, 353, 373, 383, 727, 757, 787, 797, 919, 929, 11311, 11411, 13331, 15551, 16661, 18181, 19991, 32323, 33533, 35353, 72227, 72727, 74747, 75557, 76667, 77377, 77477, 77977, 78787, 78887, 79997, 94949, 95959
(list; graph; refs; listen; history; internal format)
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