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A086009
Number of 1's in decimal expansion of n^2.
12
0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 2, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 0, 2, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 2, 1, 1, 2
OFFSET
0,12
LINKS
EXAMPLE
4^2 = 16, so a(4)=1 and 11^2 = 121, so a(11)=2.
MATHEMATICA
DigitCount[(Range[0, 100])^2, 10, 1] (* G. C. Greubel, Dec 13 2016 *)
PROG
(PARI) A086009(n)=#select(d->d==1, digits(n^2)) \\ M. F. Hasler, Feb 21 2016
CROSSREFS
Cf. 0's A086008, 2's A086010, 3's A086011, 4's A086012, 5's A086013, 6's A086014, 7's A086015, 8's A086016, 9's A086017.
Cf. A269241 for the n^3 analog.
Sequence in context: A321144 A309048 A086072 * A086010 A321929 A089198
KEYWORD
base,nonn
AUTHOR
Jason Earls, Jul 07 2003
STATUS
approved