id:A135236 - OEIS Search Results

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Numbers n such that n=s^phi(phi(s)) where s is sum of its digits.

+0
4

1, 2, 3, 4, 6, 81, 234256, 614656, 1679616, 24794911296, 2518170116818978404827136, 4301431178848799040411011070519998467949638490834092425216 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Next term has 96 digits. In fact the sequence has only 14 terms, a(13)=250^40 and a(14)=370^48.`
	EXAMPLE	`24794911296=(2+4+7+9+4+9+1+1+2+9+6)^phi(phi(2+4+7+9+4+9+1+1+2+9+6)) so 24794911296 is in the sequence.`
	CROSSREFS	`Cf. A135234, A135235, A135237.` `Sequence in context: A067244 A051856 A084811 this_sequence A029962 A021903 A058315` `Adjacent sequences: A135233 A135234 A135235 this_sequence A135237 A135238 A135239`
	KEYWORD	`base,fini,nonn`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), Nov 24 2007`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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