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A128667
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Primes p such that p^2 divides 13^(p-1) - 1.
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6
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OFFSET
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1,1
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COMMENTS
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No further terms up to 3.127*10^13.
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LINKS
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Table of n, a(n) for n=1..3.
C. K. Caldwell, Fermat quotient
Richard Fischer, Fermat quotients B^(P-1) == 1 (mod P^2)
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CROSSREFS
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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
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bref,hard,more,nonn
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AUTHOR
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Alexander Adamchuk, Mar 26 2007
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STATUS
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approved
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