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A068676
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Primes formed by the concatenation 1, n, n^2, n, 1.
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0
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12421, 13931, 163661, 186481, 115225151, 121441211, 122484221, 124576241, 131961311, 1502500501, 1512601511, 1603600601, 1674489671, 1735329731, 1806400801, 1816561811, 1100100001001, 1101102011011, 1104108161041
(list; graph; refs; listen; history; internal format)
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