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A296420 Period of last digit of multiples of n. 0
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

(PARI) a(n) = 10/gcd(n, 10) \\ Iain Fox, Dec 11 2017

CROSSREFS

Cf. A054531.

Sequence in context: A147653 A152611 A241146 * A078267 A083950 A045617

Adjacent sequences:  A296417 A296418 A296419 * A296421 A296422 A296423

KEYWORD

base,nonn

AUTHOR

Leonardo Sznajder, Dec 11 2017

EXTENSIONS

More terms from Michael De Vlieger, Dec 23 2017.

Term a(0) = 1 prepended by Halfdan Skjerning, Jun 18 2019

STATUS

approved

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Last modified November 21 01:33 EST 2019. Contains 329349 sequences. (Running on oeis4.)