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R. K. Guy, Unsolved Problems Number Theory, Sect. E34.
Table of n, a(n) for n=1..45.
Cf. A007770, A035502.
Sequence in context: A231045 A031447 A153074 * A059210 A060670 A044364
Adjacent sequences: A035500 A035501 A035502 * A035504 A035505 A035506
N. J. A. Sloane.
More terms from Sascha Kurz, Mar 24 2002