A056149 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A056149

a(0) = 1, a(m) = number of a(k), 0 <= k <= m-1, where gcd(m, a(k)) = 1.

%I #10 Oct 25 2019 21:15:03

%S 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,

%T 21,13,29,15,31,22,22,21,23,18,37,24,24,23,41,17,43,28,30,26,47,24,40,

%U 28,35,27,53,26,44,26,41,33,59,26,61,36,37,38,50,29,67,38,49,31,71,35

%N a(0) = 1, a(m) = number of a(k), 0 <= k <= m-1, where gcd(m, a(k)) = 1.

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

%Y Cf. A096216.

%K easy,nonn

%O 0,3

%A _Leroy Quet_, Aug 04 2000