id:A139408 - OEIS Search Results

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Numbers n such that phi(n)=d_1!!*d_2!!*...*d_k!! where d_1 d_2 ... d_k is the decimal expansion of n.

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1, 260, 450, 543, 630, 1164, 2080, 3534, 3640, 4525, 5425, 11176, 13365, 15407, 18333, 24056, 24552, 25064, 25452, 26352, 30660, 37324, 45136, 46160, 46325, 49321, 51742, 52080, 54540, 67122, 76041, 76151, 80325, 81060, 81217, 81532 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`phi(1111900875)=1!!1!!1!!1!!9!!0!!0!!8!!7!!*5!!, so 1111900875 is in the sequence.`
	CROSSREFS	`Cf. A066457, A139182.` `Sequence in context: A097735 A063485 A015929 this_sequence A154379 A037219 A061224` `Adjacent sequences: A139405 A139406 A139407 this_sequence A139409 A139410 A139411`
	KEYWORD	`base,easy,nonn,less`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), Apr 19 2008`

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

AT&T Labs Research