id:A145747 - OEIS Search Results

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a(n) is the smallest number m such that phi(m)+sigma(m)=n*pi(m).

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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; listen)

	OFFSET	`3,1`
	COMMENT	`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 this_sequence A055234 A086485 A068310` `Adjacent sequences: A145744 A145745 A145746 this_sequence A145748 A145749 A145750`
	KEYWORD	`nonn`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), Oct 30 2008`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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