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Search: id:A077002
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| A077002 |
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a(1) = 1, a(n+1) is the largest triangular number <= n*a(n). |
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+0
2
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| 1, 1, 1, 3, 10, 45, 253, 1770, 14028, 125751, 1256905, 13825911, 165902220, 2156701326, 30193705191, 452904989670, 7246477931241, 123190111062756, 2217421939553376, 42131016700673761, 842620333202031306
(list; graph; listen)
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OFFSET
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1,4
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MAPLE
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a[1] := 1:for n from 2 to 100 do a[n] := floor(evalf(-1/2+1/2*sqrt(1+8*(n-1)*a[n-1])+1/10^50, 300)):a[n] := a[n]*(a[n]+1)/2:od:seq(a[l], l=1..100);
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CROSSREFS
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Cf. A077003.
Sequence in context: A099237 A006220 A020026 this_sequence A003704 A000250 A118601
Adjacent sequences: A076999 A077000 A077001 this_sequence A077003 A077004 A077005
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Oct 26 2002
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EXTENSIONS
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More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Jan 26 2003
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