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This is always an integer for n>=2.
a(n) = 1 for n in A111315. When this happens A109890(n+1) makes a large jump. The corresponding values of A109890(n+1) are in A111316 (cf. A111242).
a(n) = A094340(n) for all n > 1. [From David Wasserman, Jan 06 2009]
Table of n, a(n) for n=2..70.
A109735(4)=12, A109890(5)=4, so a(4) = 12/4 = 3.
Different from A094339.
Sequence in context: A254876 A249159 A230871 * A247501 A192183 A133518
Adjacent sequences: A111238 A111239 A111240 * A111242 A111243 A111244
N. J. A. Sloane, Oct 30 2005