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A078704 Integer part of the square root of phi(n). 1
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, 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, 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

a(n) is equal to number of positive squares <= A000010(n). - Giovanni Teofilatto, May 05 2010, corrected by Antti Karttunen, Aug 22 2017

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A000196(A000010(n)). - Antti Karttunen, Aug 22 2017

MATHEMATICA

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

CROSSREFS

Cf. A000010, A000196.

Sequence in context: A083552 A176835 A237110 * A032358 A011960 A187035

Adjacent sequences:  A078701 A078702 A078703 * A078705 A078706 A078707

KEYWORD

easy,nonn,look

AUTHOR

Joseph L. Pe, Dec 18 2002

STATUS

approved

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Last modified January 19 16:10 EST 2019. Contains 319307 sequences. (Running on oeis4.)