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A091425
Write the natural numbers in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.
15
1, 3, 6, 1, 2, 5, 1, 2, 7, 2, 3, 4, 0, 7, 6, 7, 1, 0, 1, 6, 3, 1, 8, 6, 1, 3, 2, 1, 1, 1, 2, 2, 3, 2, 6, 8, 2, 3, 6, 3, 3, 7, 3, 6, 1, 3, 2, 8, 4, 1, 8, 4, 3, 1, 5, 8, 7, 6, 6, 6, 6, 7, 8, 7, 1, 3, 7, 8, 1, 8, 8, 2, 9, 1, 6, 1, 0, 7, 6, 8, 7, 1, 1, 1, 1, 2, 3, 5, 8, 3, 1, 1, 3, 3, 1, 4, 5, 4, 1, 1, 5, 0, 1, 4, 8
OFFSET
1,2
COMMENTS
1
23
456
7891
01112
131415
1617181...
MATHEMATICA
t = Flatten[IntegerDigits /@ Range[5565]]; t[[ Table[n(n + 1)/2, {n, 105}]]] (* Robert G. Wilson v, Feb 24 2005 *)
KEYWORD
base,easy,nonn
AUTHOR
J. Taylor (integersfan(AT)yahoo.com), Mar 02 2004
STATUS
approved