id:A131827 - OEIS Search Results

Search: id:A131827

Displaying 1-1 of 1 results found.

page 1

Numbers n such that cototient(x) = n has exactly 2 solutions.

+0
1

4, 7, 9, 11, 13, 15, 36, 37, 44, 46, 54, 56, 70, 80, 84, 88, 90, 92, 94, 112, 118, 138, 142, 152, 158, 160, 162, 164, 166, 174, 176, 182, 184, 188, 198, 210, 212, 214, 228, 230, 234, 236 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`4 = cototient(6) = cototient(8) and there are no other solutions.`
	CROSSREFS	`Cf. A051953.` `Adjacent sequences: A131824 A131825 A131826 this_sequence A131828 A131829 A131830` `Sequence in context: A010454 A053169 A007656 this_sequence A035245 A109180 A025054`
	KEYWORD	`nonn`
	AUTHOR	`Franz Vrabec (franz.vrabec(AT)planetuniqa.at), Jul 19 2007`

page 1

Search completed in 0.002 seconds

Last modified October 6 16:13 EDT 2008. Contains 144667 sequences.

AT&T Labs Research