A326055 - OEIS

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A326055

a(n) = n - {the largest square that divides n}.

0, 1, 2, 0, 4, 5, 6, 4, 0, 9, 10, 8, 12, 13, 14, 0, 16, 9, 18, 16, 20, 21, 22, 20, 0, 25, 18, 24, 28, 29, 30, 16, 32, 33, 34, 0, 36, 37, 38, 36, 40, 41, 42, 40, 36, 45, 46, 32, 0, 25, 50, 48, 52, 45, 54, 52, 56, 57, 58, 56, 60, 61, 54, 0, 64, 65, 66, 64, 68, 69, 70, 36, 72, 73, 50, 72, 76, 77, 78, 64, 0, 81, 82, 80, 84

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

OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..20000

FORMULA

a(n) = n - A008833(n).

a(n) = A326054(n) + A033879(n).

a(A000203(n)) = A326040(n).

MATHEMATICA

Table[n-Max[Select[Divisors[n], IntegerQ[Sqrt[#]]&]], {n, 100}] (* Harvey P. Dale, Apr 21 2020 *)

PROG