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A145747 a(n) is the smallest number m such that phi(m)+sigma(m)=n*pi(m). 0
3, 2, 14, 26, 55, 30, 56, 329, 626, 366, 340, 558, 288, 552, 828, 3496, 6928, 2430, 81809, 3920, 3432, 8680, 48380, 23430, 2520, 144020, 435056, 21384, 728096, 188376, 11802175, 97320, 54057938, 89700, 349752, 1143492, 11286632, 490752 (list; graph; refs; listen; history; internal format)
OFFSET

3,1

COMMENTS

a(47) is greater than 4*10^8.

MATHEMATICA

a[n_]:=(For[m=1, DivisorSigma[1, m]+EulerPhi[m]!=n EulerPhi[m], m++ ]; m); Do[Print[a[n]], {n, 3, 46}]

CROSSREFS

Cf. A015704.

Sequence in context: A098384 A064536 A163355 * A055234 A204990 A086485

Adjacent sequences:  A145744 A145745 A145746 * A145748 A145749 A145750

KEYWORD

nonn

AUTHOR

Farideh Firoozbakht (mymontain(AT)yahoo.com), Oct 30 2008

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Last modified February 17 13:07 EST 2012. Contains 206026 sequences.