1,2
R. K. Guy, Unsolved Problems Number Theory, Sect E35.
C. Kimberling, Problem 1615, Crux Mathematicorum, Vol. 17 (2) 44 1991.
Cf. A007063.
Sequence in context: A040616 A040620 A040621 this_sequence A040622 A040623 A094582
Adjacent sequences: A006849 A006850 A006851 this_sequence A006853 A006854 A006855
nonn,nice
njas
7593 corrected to 7598 by Hans Havermann (pxp(AT)rogers.com) 7/98.
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