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 A078704 Integer part of the square root of phi(n). 1

%I #8 Aug 23 2017 06:08:16

%S 1,1,1,1,2,1,2,2,2,2,3,2,3,2,2,2,4,2,4,2,3,3,4,2,4,3,4,3,5,2,5,4,4,4,

%T 4,3,6,4,4,4,6,3,6,4,4,4,6,4,6,4,5,4,7,4,6,4,6,5,7,4,7,5,6,5,6,4,8,5,

%U 6,4,8,4,8,6,6,6,7,4,8,5,7,6,9,4,8,6,7,6,9,4,8,6,7,6,8,5,9,6,7,6

%N Integer part of the square root of phi(n).

%C a(n) is equal to number of positive squares <= A000010(n). - _Giovanni Teofilatto_, May 05 2010, corrected by _Antti Karttunen_, Aug 22 2017

%H Antti Karttunen, <a href="/A078704/b078704.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = A000196(A000010(n)). - _Antti Karttunen_, Aug 22 2017

%t Table[Floor[Sqrt[EulerPhi[i]]], {i, 1, 100}]

%Y Cf. A000010, A000196.

%K easy,nonn,look

%O 1,5

%A _Joseph L. Pe_, Dec 18 2002

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Last modified June 18 21:06 EDT 2024. Contains 373487 sequences. (Running on oeis4.)