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A270296 Numbers which are representable as a sum of five but no fewer consecutive nonnegative integers. 9

%I #22 Feb 04 2021 18:15:21

%S 20,40,80,100,140,160,200,220,260,280,320,340,380,400,440,460,500,520,

%T 560,580,620,640,680,700,740,760,800,820,860,880,920,940,980,1000,

%U 1040,1060,1100,1120,1160,1180,1220,1240,1280,1300,1340,1360,1400,1420,1460

%N Numbers which are representable as a sum of five but no fewer consecutive nonnegative integers.

%H Ray Chandler, <a href="/A270296/b270296.txt">Table of n, a(n) for n = 1..10000</a>

%F A163169(a(n)) = 5. - _Ray Chandler_, Mar 22 2016

%F a(n) = 20*A001651(n). - _Hugo Pfoertner_, Feb 04 2021

%e 15 = 1 + 2 + 3 + 4 + 5 = 7 + 8 (not in sequence);

%e 20 = 2 + 3 + 4 + 5 + 6;

%e 40 = 6 + 7 + 8 + 9 + 10;

%e 80 = 14 + 15 + 16 + 17 + 18.

%Y Cf. A001651, A138591, A270297, A270298, A270299, A270300, A270301, A270302, A270303.

%K nonn

%O 1,1

%A _Martin Renner_, Mar 14 2016

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Last modified April 25 07:07 EDT 2024. Contains 371964 sequences. (Running on oeis4.)