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A079543
Numbers n such that n has at least two distinct prime factors and if a prime p divides n then (p-1)|(n-1) and (p+1)|(n+1).
+0
2
74431, 71528191, 125780831, 178708831, 4150390625
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.
AT&T Labs Research
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