A104639 Number of even digits in n^3.

0, 1, 1, 2, 1, 2, 1, 1, 1, 3, 0, 2, 1, 3, 0, 3, 1, 2, 2, 4, 2, 4, 2, 3, 2, 1, 2, 2, 3, 4, 1, 3, 0, 2, 3, 4, 2, 3, 0, 5, 3, 4, 1, 3, 1, 1, 3, 2, 2, 4, 2, 5, 3, 3, 2, 2, 1, 1, 2, 5, 4, 4, 4, 5, 4, 4, 3, 3, 3, 4, 0, 3, 2, 5, 3, 3, 2, 3, 2, 4, 2, 2, 1, 3, 3, 4, 3, 4, 3, 4, 0, 4, 3, 4, 1, 4, 2, 2, 2, 6

Offset

1,4

Links

G. C. Greubel, Table of n, a(n) for n = 1..10000

Formula

a(n) = A196563(n^3). - Michel Marcus, Oct 05 2013

Mathematica

Table[Count[IntegerDigits[n^3], _?EvenQ], {n, 100}] (* _G. c. Greubel_, Aug 13 2018 *)

Prog

(PARI) a(n) = my(d = digits(n^3)); sum(i=1, #d, 1 - (d[i] % 2)); \\ Michel Marcus, Oct 05 2013

Crossrefs

Cf. A104640, A196563.

Sequence in context: A362951 A342464 A061342 * A260704 A161223 A145672

Adjacent sequences: A104636 A104637 A104638 * A104640 A104641 A104642

Keyword

easy,nonn,base

Author

Zak Seidov, Mar 18 2005

Status

approved