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A162610
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Triangle read by rows in which row n lists n terms, starting with 2n-1, with gaps = n-1 between successive terms.
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20
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1, 3, 4, 5, 7, 9, 7, 10, 13, 16, 9, 13, 17, 21, 25, 11, 16, 21, 26, 31, 36, 13, 19, 25, 31, 37, 43, 49, 15, 22, 29, 36, 43, 50, 57, 64, 17, 25, 33, 41, 49, 57, 65, 73, 81, 19, 28, 37, 46, 55, 64, 73, 82, 91, 100, 21, 31, 41, 51, 61, 71, 81, 91, 101, 111, 121
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Note that the last term of the n-th row is the n-th square A000290(n).
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LINKS
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FORMULA
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EXAMPLE
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Triangle begins:
1
3, 4
5, 7, 9
7, 10, 13, 16
9, 13, 17, 21, 25
11, 16, 21, 26, 31, 36
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MATHEMATICA
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Flatten[Table[NestList[#+n-1&, 2n-1, n-1], {n, 15}]] (* Harvey P. Dale, Oct 20 2011 *)
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PROG
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return 2*n-1+(k-1)*(n-1)
print([A162610(n, k) for n in range(1, 20) for k in range(1, n+1)])
(Haskell)
a162610 n k = k * n - k + n
a162610_row n = map (a162610 n) [1..n]
a162610_tabl = map a162610_row [1..]
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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