A039788 - OEIS

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A039788

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

9, 16, 35, 45, 150, 154, 234, 264 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Next term if it exists is greater than 10000000. - C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 29 2004`
	LINKS	`Table of n, a(n) for n=1..8.`
	EXAMPLE	`phi(45)=24, 45=3^25^1, (3+5)(2+1)=24.`
	PROG	`(PARI) for(n=1, 10000000, f=factor(n); l=#f[, 1]; if(eulerphi(n)==sum(i=1, l, f[i, 1])*sum(i=1, l, f[i, 2]), print1(n, ", "))) (Ronaldo)`
	CROSSREFS	`Cf. A000010, A039697.` `Sequence in context: A048752 A162616 A153362 * A175652 A110833 A076621` `Adjacent sequences: A039785 A039786 A039787 * A039789 A039790 A039791`
	KEYWORD	`nonn,more`
	AUTHOR	`Olivier Gérard`
	STATUS	`approved`

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Last modified May 23 09:36 EDT 2013. Contains 225586 sequences.