OFFSET
1,4
COMMENTS
REFERENCES
R. K. Guy, Unsolved problems in number theory, B39.
LINKS
T. D. Noe, Table of n, a(n) for n=1..10000
T. D. Noe, Numbers Like 16842752
William P. Wardlaw, L. L. Foster and R. J. Simpson, Problem E3361, Amer. Math. Monthly, Vol. 98, No. 5 (May, 1991), 443-444.
CROSSREFS
KEYWORD
nonn
AUTHOR
T. D. Noe, Aug 14 2008
STATUS
approved