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A056149 a(0) = 1, a(m) = number of a(k), 0 <= k <= m-1, where gcd(m, a(k)) = 1. 1
1, 1, 2, 3, 3, 5, 3, 7, 7, 6, 7, 11, 7, 13, 8, 10, 12, 17, 10, 19, 13, 12, 14, 23, 13, 22, 14, 21, 13, 29, 15, 31, 22, 22, 21, 23, 18, 37, 24, 24, 23, 41, 17, 43, 28, 30, 26, 47, 24, 40, 28, 35, 27, 53, 26, 44, 26, 41, 33, 59, 26, 61, 36, 37, 38, 50, 29, 67, 38, 49, 31, 71, 35 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..72.

EXAMPLE

a(6) = 3 because a(0), a(1) and a(5) are relatively prime to 6.

CROSSREFS

Cf. A096216.

Sequence in context: A070800 A138663 A330834 * A167494 A091238 A178047

Adjacent sequences:  A056146 A056147 A056148 * A056150 A056151 A056152

KEYWORD

easy,nonn

AUTHOR

Leroy Quet, Aug 04 2000

STATUS

approved

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Last modified May 12 05:25 EDT 2021. Contains 343811 sequences. (Running on oeis4.)