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1,7

Table of n, a(n) for n=1..89.

a(10) = 2, a(100) = 17, a(1000) = 121, a(10000) = 1066.

Cf. A111890, A111891, A111892, A111893, A111895, A111896, A111897, A111898, A111899, A111854.

Sequence in context: A074802 A071804 A280953 * A279012 A292027 A025845

Adjacent sequences: A111891 A111892 A111893 * A111895 A111896 A111897

nonn,base

Reinhard Zumkeller, Aug 20 2005

approved