A055769 - OEIS

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A055769

Largest prime dividing EulerPhi of the n-th primorial.

1, 2, 2, 3, 5, 5, 5, 5, 11, 11, 11, 11, 11, 11, 23, 23, 29, 29, 29, 29, 29, 29, 41, 41, 41, 41, 41, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 83, 83, 89, 89, 89, 89, 89, 89, 89, 89, 113, 113, 113, 113, 113, 113, 113, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`a(n)=A001221(A000010(A002110(n)))`
	EXAMPLE	`While the largest prime factors of 10th,100th or 1000th primorials are 29,541,7919, those of their EulerPhi are 11,251,3911 resp.`
	CROSSREFS	`Cf. A000010, A002110, A005867.` `Sequence in context: A139171 A050174 A115126 * A162217 A123575 A014200` `Adjacent sequences: A055766 A055767 A055768 * A055770 A055771 A055772`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Jul 12 2000`

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Last modified February 14 16:28 EST 2012. Contains 205635 sequences.