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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
FORMULA
a(n) = A000196(A000010(n)). - Antti Karttunen, Aug 22 2017
MATHEMATICA
Table[Floor[Sqrt[EulerPhi[i]]], {i, 1, 100}]
CROSSREFS
Sequence in context: A176835 A353865 A237110 * A306468 A032358 A011960
KEYWORD
easy,nonn,look
AUTHOR
Joseph L. Pe, Dec 18 2002
STATUS
approved

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Last modified May 18 15:59 EDT 2024. Contains 372664 sequences. (Running on oeis4.)