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Search: id:A064776
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| A064776 |
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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. |
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+0
2
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| 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; listen)
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OFFSET
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1,1
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COMMENT
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Why do so many terms end with a string of zeros? - Zak Seidov, Jan 01 2008
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EXAMPLE
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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 non-squares.
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CROSSREFS
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Cf. A133662.
Cf. A133662.
Sequence in context: A154923 A154693 A065854 this_sequence A096659 A154695 A154646
Adjacent sequences: A064773 A064774 A064775 this_sequence A064777 A064778 A064779
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KEYWORD
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nonn
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AUTHOR
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Jonathan Ayres (jonathan.ayres(AT)btinternet.com), Oct 18 2001
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EXTENSIONS
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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
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