id:A145748 - OEIS Search Results

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Numbers n such that phi(n+1)-phi(n)=sigma(n+1)-sigma(n).

+0
3

2, 854, 751358, 1421637, 8775206, 8892195, 16485944, 31845344 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`This sequence is a subsequence of A066198.`
	MATHEMATICA	`de[n_]:=DivisorSigma[1, n]-EulerPhi[n]; Do[If[de[n]==de[n+1], Print[n]], {n, 50000000}]`
	CROSSREFS	`Cf. A066198, A145749.` `Sequence in context: A013537 A028485 A034227 this_sequence A141185 A128667 A050247` `Adjacent sequences: A145745 A145746 A145747 this_sequence A145749 A145750 A145751`
	KEYWORD	`more,nonn`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), Nov 01 2008`

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Last modified November 25 13:47 EST 2009. Contains 167481 sequences.