A039774 - OEIS

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A039774

phi(a(n)) is equal to the product of (the sum of prime factors and the sum of exponents) of (a(n)-1).

3, 5, 9, 25, 31, 57, 116, 144, 154, 288, 372, 414, 624, 792, 10032 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Next term if it exists is greater than 100000.`
	LINKS	`Table of n, a(n) for n=1..15.`
	EXAMPLE	`phi(25)=20, 24=2^33^1, (2+3)(3+1)=20.`
	CROSSREFS	`Cf. A000010, A039697.` `Sequence in context: A083366 A006722 A251413 * A114001 A171879 A171877` `Adjacent sequences: A039771 A039772 A039773 * A039775 A039776 A039777`
	KEYWORD	`nonn`
	AUTHOR	`Olivier Gérard`
	STATUS	`approved`

Last modified February 15 22:28 EST 2019. Contains 320138 sequences. (Running on oeis4.)