A162684 - OEIS

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A162684

a(1)=1. a(n) = the number of terms among (a(1),a(2),...a(n-1)) that either are coprime to n or divide n.

1, 1, 2, 3, 4, 4, 6, 6, 6, 4, 10, 10, 12, 4, 8, 9, 16, 8, 18, 11, 14, 6, 22, 16, 22, 6, 19, 12, 28, 13, 30, 16, 20, 8, 28, 20, 36, 8, 27, 21, 40, 14, 42, 16, 26, 10, 46, 26, 42, 13, 35, 18, 52, 18, 44, 22, 39, 13, 58, 26, 60, 14, 39, 27, 49, 19, 66, 22, 45, 22, 70, 32, 72, 19, 42, 24

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

OFFSET

1,3

LINKS

Table of n, a(n) for n=1..76.

CROSSREFS

A162683

Sequence in context: A126012 A283267 A096908 * A265533 A145340 A307989

Adjacent sequences: A162681 A162682 A162683 * A162685 A162686 A162687

KEYWORD

nonn

AUTHOR

Leroy Quet, Jul 10 2009

EXTENSIONS

More terms from Sean A. Irvine, Nov 03 2009

STATUS

approved