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A104609
Write the natural numbers in base 5 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.
15
1, 3, 0, 2, 2, 2, 1, 0, 1, 0, 1, 1, 3, 1, 2, 1, 2, 2, 4, 3, 3, 3, 4, 4, 3, 0, 0, 0, 4, 1, 2, 0, 1, 2, 2, 3, 2, 1, 3, 3, 2, 2, 1, 1, 4, 2, 0, 2, 2, 1, 4, 0, 4, 3, 3, 2, 3, 3, 4, 4, 2, 4, 2, 3, 4, 3, 4, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 4, 2, 1, 1, 2, 2, 3, 1, 1, 3, 1, 4, 1, 1, 4, 1, 4, 1, 2
OFFSET
1,2
COMMENTS
1
23
410
1112
13142
021222...
MATHEMATICA
t = Flatten[IntegerDigits[Range[1500], 5]]; t[[Table[n(n + 1)/2, {n, 105}]]]
KEYWORD
base,nonn
AUTHOR
Robert G. Wilson v, Mar 16 2005
STATUS
approved