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2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 3, 3, 2, 2, 2, 4, 3, 3, 2, 2, 2, 5, 4, 3, 3, 2, 2, 2, 6, 5, 4, 3, 3, 2, 2, 2, 7, 6, 5, 4, 3, 3, 2, 2, 2, 9, 7, 6, 5, 4, 3, 3, 2, 2, 2, 11, 9, 7, 6, 5, 4, 3, 3, 2, 2, 2, 13, 11, 9, 7, 6, 5, 4, 3, 3, 2, 2, 2, 16, 13, 11, 9, 7, 6, 5, 4, 3, 3, 2, 2, 2, 19, 16, 13, 11, 9, 7, 6, 5
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| In row 1 of A068009 the first term > 1 is found at position 1, for rows 2 & 3 at position 2, for rows 4,5,6 at position 3, for rows 7,8,9,10 at position 4 etc., thus it is natural to view this also as a triangular table.
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MAPLE
| [seq(A000009(A025581(j-1))+1, j=1..99)];
A025581 := n-> binomial(1+floor(1/2+sqrt(2+2*n)), 2)-(n+1);
N := 100; t1 := series(mul(1+x^k, k=1..N), x, N); A000009 := proc(n) coeff(t1, x, n); end;
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CROSSREFS
| a(n) = A000009(A025581(n-1))+1. Specifically, the left edge is equal to A000009[n]+1 (i.e. apart from the first term = A052839) and the right edge is all-2 sequence A007395.
Sequence in context: A184156 A024708 A096917 * A171092 A141256 A131841
Adjacent sequences: A068046 A068047 A068048 * A068050 A068051 A068052
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KEYWORD
| nonn,tabl
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AUTHOR
| Antti Karttunen, Feb 11 2002
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