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A190321 Number of nonzero digits when writing n in base where place values are squares, cf. A007961. 4
0, 1, 1, 1, 1, 2, 2, 2, 1, 1, 2, 2, 2, 2, 3, 3, 1, 2, 2, 2, 2, 3, 3, 3, 2, 1, 2, 2, 2, 2, 3, 3, 3, 2, 2, 3, 1, 2, 2, 2, 2, 3, 3, 3, 2, 2, 3, 3, 3, 1, 2, 2, 2, 2, 3, 3, 3, 2, 2, 3, 3, 3, 3, 4, 1, 2, 2, 2, 2, 3, 3, 3, 2, 2, 3, 3, 3, 3, 4, 4, 2, 1, 2, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

COMMENTS

For n > 0: a(A000290(n)) = 1; for n > 1: a(A002522(n)) = 2;

a(n) <= A000196(n).

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

PROG

(Haskell)

a190321 n = g n $ reverse $ takeWhile (<= n) $ tail a000290_list where

  g _ []                 = 0

  g m (x:xs) | x > m     = g m xs

             | otherwise = signum m' + g r xs where (m', r) = divMod m x

CROSSREFS

Cf. A190311, A053610.

Sequence in context: A091237 A143477 A214774 * A238890 A266968 A237593

Adjacent sequences:  A190318 A190319 A190320 * A190322 A190323 A190324

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, May 08 2011

STATUS

approved

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Last modified November 20 08:16 EST 2018. Contains 317385 sequences. (Running on oeis4.)