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A331176 a(n) = n - n/gcd(n, phi(n)), where phi is Euler totient function. 1
0, 0, 0, 2, 0, 3, 0, 6, 6, 5, 0, 9, 0, 7, 0, 14, 0, 15, 0, 15, 14, 11, 0, 21, 20, 13, 24, 21, 0, 15, 0, 30, 0, 17, 0, 33, 0, 19, 26, 35, 0, 35, 0, 33, 30, 23, 0, 45, 42, 45, 0, 39, 0, 51, 44, 49, 38, 29, 0, 45, 0, 31, 56, 62, 0, 33, 0, 51, 0, 35, 0, 69, 0, 37, 60, 57, 0, 65, 0, 75, 78, 41, 0, 77, 0, 43, 0, 77, 0, 75 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..16384

Antti Karttunen, Data supplement: n, a(n) computed for n = 1..65537

FORMULA

a(n) = n - A109395(n).

PROG

(PARI) A331176(n) = (n - (n/gcd(n, eulerphi(n))));

CROSSREFS

Cf. A000010, A009195, A109395.

Cf. A003277 (indices of zeros).

Sequence in context: A081155 A130628 A249431 * A076563 A163974 A317443

Adjacent sequences:  A331173 A331174 A331175 * A331177 A331178 A331179

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jan 11 2020

STATUS

approved

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Last modified March 29 13:26 EDT 2020. Contains 333107 sequences. (Running on oeis4.)