|
| |
|
|
A064776
|
|
a(n) is smallest number >= a(n-1) such that a(n) plus any set of the previous values of the sequence is a nonsquare.
|
|
1
| |
|
|
2, 3, 3, 5, 21, 24, 24, 80, 80, 80, 480, 480, 720, 1200, 2000, 8400, 9600, 9600, 32000, 32000, 32000, 192000, 192000, 288000, 480000, 800000, 3360000, 3840000, 3840000, 12800000, 12800000, 12800000, 76800000, 76800000, 115200000, 192000000
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| Why do so many terms end with a string of zeros? - Zak Seidov, Jan 01 2008
|
|
|
EXAMPLE
| a(3) = 3 because possible sums are 3, 3+a(1), 3+a(2), 3+a(1)+a(2) = 3, 3+2, 3+3, 3+2+3 = 3,5,6,8, all of which are nonsquares.
|
|
|
CROSSREFS
| Cf. A133662.
Cf. A133662.
Sequence in context: A154923 A154693 A065854 * A096659 A154695 A154646
Adjacent sequences: A064773 A064774 A064775 * A064777 A064778 A064779
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Jonathan Ayres (jonathan.ayres(AT)btinternet.com), Oct 18 2001
|
|
|
EXTENSIONS
| More terms from Larry Reeves (larryr(AT)acm.org), Oct 10 2003
More terms and better definition from Don Reble (djr(AT)nk.ca), Jan 01 2008
|
| |
|
|
