A296420 - OEIS

A296420

Period of last digit of multiples of n.

1, 10, 5, 10, 5, 2, 5, 10, 5, 10, 1, 10, 5, 10, 5, 2, 5, 10, 5, 10, 1, 10, 5, 10, 5, 2, 5, 10, 5, 10, 1, 10, 5, 10, 5, 2, 5, 10, 5, 10, 1, 10, 5, 10, 5, 2, 5, 10, 5, 10, 1, 10, 5, 10, 5, 2, 5, 10, 5, 10, 1, 10, 5, 10, 5, 2, 5, 10, 5, 10, 1, 10, 5, 10, 5, 2, 5, 10

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

The list is periodic, with period 10.

LINKS

Table of n, a(n) for n=0..77.

EXAMPLE

a(6)=5 because multiples of 6 are 6, 12, 18, 24, 30, 36, 42 and the last digits of those numbers are 6,2,8,4,0,6,2,... with a period of 5.

MATHEMATICA

Array[10/GCD[#, 10] &, 77] (* Michael De Vlieger, Dec 23 2017 *)

PROG