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Reinhard Zumkeller, Table of n, a(n) for n = 0..10000
7 is 111_2 (has 1), 21_3 (has 2), 13_4 (has 3), but 12_5 (no 4), so a(7)=5.
a119352 n = f 2 n where
f b x = g x where
g 0 = b
g z = if r == b - 1 then f (b + 1) n else g z'
where (z', r) = divMod z b
-- Reinhard Zumkeller, Apr 12 2015
Cf. A119353, A119354, A106370.
Sequence in context: A101497 A065870 A123699 * A205010 A204932 A079086
Adjacent sequences: A119349 A119350 A119351 * A119353 A119354 A119355
Franklin T. Adams-Watters, May 15 2006