id:A057826 - OEIS Search Results

Search: id:A057826

Displaying 1-1 of 1 results found.

page 1

Greatest number with totient 2n (or zero when no such number exists).

+0
1

6, 12, 18, 30, 22, 42, 0, 60, 54, 66, 46, 90, 0, 58, 62, 120, 0, 126, 0, 150, 98, 138, 94, 210, 0, 106, 162, 174, 118, 198, 0, 240, 134, 0, 142, 270, 0, 0, 158, 330, 166, 294, 0, 276, 0, 282, 0, 420, 0, 250, 206, 318, 214, 378, 242, 348, 0, 354, 0, 462, 0, 0, 254, 510 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`When a(n) = 0, the Nontotients (A005277)/2`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..10000`
	MATHEMATICA	`a = Table[0, {100}]; Do[ t = EulerPhi[n]/2; If[t < 101, a[[t]] = n], {n, 1, 10^3}]; a`
	CROSSREFS	`Bisection of A057635.` `Adjacent sequences: A057823 A057824 A057825 this_sequence A057827 A057828 A057829` `Sequence in context: A108587 A079424 A088345 this_sequence A134107 A067143 A059961`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 08 2000`

page 1

Search completed in 0.002 seconds

Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

AT&T Labs Research