id:A085730 - OEIS Search Results

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Euler's totient of prime factors of prime powers: phi(p^e).

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1, 1, 2, 2, 4, 6, 4, 6, 10, 12, 8, 16, 18, 22, 20, 18, 28, 30, 16, 36, 40, 42, 46, 42, 52, 58, 60, 32, 66, 70, 72, 78, 54, 82, 88, 96, 100, 102, 106, 108, 112, 110, 100, 126, 64, 130, 136, 138, 148, 150, 156, 162, 166, 156, 172, 178, 180, 190, 192, 196, 198, 210 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n) = A000010(A000961(n)).`
	LINKS	`Eric Weisstein's World of Mathematics, Prime Power.` `Eric Weisstein's World of Mathematics, Totient Function.`
	FORMULA	`a(p^e) = (p-1)p^(e-1): a(n)=(A025473(n)-1)A025473(n)^(A025474(n)-1).`
	CROSSREFS	`Sequence in context: A073256 A166362 A050469 this_sequence A089002 A097089 A096466` `Adjacent sequences: A085727 A085728 A085729 this_sequence A085731 A085732 A085733`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 20 2003`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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