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A104619
Write the natural numbers in base 16 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.
16
1, 3, 6, 10, 15, 2, 1, 1, 14, 3, 2, 2, 5, 12, 4, 4, 4, 13, 6, 7, 11, 6, 9, 9, 10, 7, 12, 13, 1, 0, 1, 10, 5, 1, 12, 8, 1, 1, 14, 1, 9, 7, 1, 4, 3, 1, 2, 2, 1, 3, 4, 2, 7, 9, 2, 14, 1, 2, 8, 12, 2, 5, 10, 3, 5, 11, 3, 8, 15, 3, 14, 6, 3, 7, 0, 4, 3, 13, 4, 2, 13, 4, 4, 0, 5, 9, 6, 5, 1, 15, 5, 12, 11, 6
OFFSET
1,2
COMMENTS
1
23
456
789A
BCDEF
101112...
MATHEMATICA
t = Flatten[ IntegerDigits[ Range[1900], 16]]; t[[Table[n(n + 1)/2, {n, 100}]]]
KEYWORD
base,nonn
AUTHOR
Robert G. Wilson v, Mar 16 2005
STATUS
approved