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A029939
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Sum phi(d)^2; d|n.
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9
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1, 2, 5, 6, 17, 10, 37, 22, 41, 34, 101, 30, 145, 74, 85, 86, 257, 82, 325, 102, 185, 202, 485, 110, 417, 290, 365, 222, 785, 170, 901, 342, 505, 514, 629, 246, 1297, 650, 725, 374, 1601, 370, 1765, 606, 697, 970
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Equals the inverse Mobius transform (A051731) of A127473 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 20 2008]
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FORMULA
| Multiplicative with a(p^e) = (p^(2*e)*(p-1)+2)/(p+1). - Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 19 2001
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MAPLE
| with(numtheory): A029939 := proc(n) local i, j; j := 0; for i in divisors(n) do j := j+phi(i)^2; od; j; end;
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CROSSREFS
| Cf. A062367.
A127473 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 20 2008]
Sequence in context: A101325 A042980 A048290 * A082198 A098871 A146477
Adjacent sequences: A029936 A029937 A029938 * A029940 A029941 A029942
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KEYWORD
| nonn,mult
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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