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A128667
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Primes p such that p^2 divides 13^(p-1) - 1.
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5
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OFFSET
| 1,1
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COMMENTS
| No further terms up to 3.127*10^13.
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LINKS
| C. K. Caldwell, Fermat quotient
Richard Fischer, Fermat quotients B^(P-1) == 1 (mod P^2)
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CROSSREFS
| Cf. A001220, A014127, A123692, A123693, A128668, A090968, A128669, A039951
Sequence in context: A034227 A145748 A141185 * A199947 A050247 A159705
Adjacent sequences: A128664 A128665 A128666 * A128668 A128669 A128670
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KEYWORD
| bref,hard,more,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Mar 26 2007
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