A059018 Write 10*n in base 4; a(n) = sum of digits mod 4.

0, 0, 2, 2, 0, 1, 2, 0, 2, 2, 0, 0, 2, 0, 1, 2, 0, 0, 2, 2, 1, 2, 3, 0, 2, 2, 2, 2, 0, 1, 2, 3, 2, 2, 0, 0, 2, 3, 0, 2, 0, 0, 2, 2, 0, 2, 3, 0, 2, 2, 0, 0, 0, 1, 2, 3, 1, 1, 0, 0, 2, 3, 0, 1, 0, 0, 2, 2, 0, 1, 2, 0, 2, 2, 0, 0, 2, 1, 2, 3, 1, 1, 3, 3, 2, 3, 0, 1, 3, 3, 2, 2, 0, 1, 2, 3, 2, 2, 0, 0

Offset

0,3

Links

Harvey P. Dale, Table of n, a(n) for n = 0..1000

Example

50_10 = 302_4, so a(5) = 3+0+2 (mod 4) = 1.

Mathematica

Table[Mod[Total[IntegerDigits[10n, 4]], 4], {n, 0, 120}] (* Harvey P. Dale, Apr 02 2022 *)

Crossrefs

Sequence in context: A079531 A182882 A134178 * A249371 A122190 A237291

Adjacent sequences: A059015 A059016 A059017 * A059019 A059020 A059021

Keyword

base,easy,nonn

Author

Robert Lozyniak (11(AT)onna.com), Feb 12 2001

Status

approved