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Question Number 135958 by benjo_mathlover last updated on 17/Mar/21

Find the value of n such that   ((n(n+1))/2) = k (mod 10) for  n is integer number

$${Find}\:{the}\:{value}\:{of}\:{n}\:{such}\:{that} \\ $$$$\:\frac{{n}\left({n}+\mathrm{1}\right)}{\mathrm{2}}\:=\:{k}\:\left({mod}\:\mathrm{10}\right)\:{for} \\ $$$${n}\:{is}\:{integer}\:{number}\: \\ $$

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