1,2
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
R. K. Guy, Unsolved Problems in Number Theory, E26.
Cf. A005240.
Sequence in context: A010396 A010431 A010438 this_sequence A028845 A050626 A050627
Adjacent sequences: A005238 A005239 A005240 this_sequence A005242 A005243 A005244
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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