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am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(N-1)
Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27 2001.
Table of n, a(n) for n=0..11.
Sequence in context: A014362 A143042 A206642 * A235770 A204538 A204534
Adjacent sequences: A064258 A064259 A064260 * A064262 A064263 A064264
N. J. A. Sloane, Sep 23 2001