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A104615
Write the natural numbers in base 12 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.
15
1, 3, 6, 10, 1, 4, 1, 2, 4, 9, 3, 3, 3, 10, 5, 6, 10, 7, 8, 9, 1, 0, 1, 1, 1, 1, 1, 3, 1, 1, 6, 1, 1, 8, 1, 1, 11, 2, 2, 3, 2, 2, 6, 2, 2, 10, 2, 3, 2, 3, 3, 6, 3, 3, 11, 4, 4, 3, 4, 4, 8, 4, 5, 2, 5, 5, 7, 5, 5, 1, 6, 6, 7, 6, 6, 1, 7, 7, 8, 7, 8, 2, 8, 8, 9, 9, 9, 5, 9, 9, 0, 10, 10, 8, 10, 11, 4, 11, 11, 0
OFFSET
1,2
COMMENTS
1
23
456
789A
B1011
121314...
MATHEMATICA
t = Flatten[ IntegerDigits[ Range[1900], 12]]; t[[Table[n(n + 1)/2, {n, 100}]]]
KEYWORD
base,nonn
AUTHOR
Robert G. Wilson v, Mar 16 2005
STATUS
approved