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A104608 Write the natural numbers in base 4 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal. 15
1, 3, 1, 1, 1, 0, 1, 2, 1, 1, 0, 0, 2, 1, 2, 3, 1, 3, 1, 2, 2, 1, 1, 1, 2, 0, 0, 2, 1, 0, 2, 2, 2, 1, 0, 2, 0, 0, 3, 3, 2, 2, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 2, 3, 2, 1, 1, 2, 2, 3, 1, 1, 3, 2, 0, 2, 2, 1, 0, 1, 2, 2, 2, 3, 2, 2, 2, 3, 3, 3, 3, 3, 0, 0, 1, 3, 3, 2, 2, 2, 3, 3, 3, 2, 3, 0, 1, 1, 2, 1, 1, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
1
23
101
1121
32021
222330...
LINKS
MATHEMATICA
t = Flatten[IntegerDigits[Range[1500], 4]]; t[[Table[n(n + 1)/2, {n, 105}]]]
CROSSREFS
Sequence in context: A285000 A321444 A338889 * A241499 A236774 A110245
KEYWORD
base,nonn
AUTHOR
Robert G. Wilson v, Mar 16 2005
STATUS
approved

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Last modified March 19 03:33 EDT 2024. Contains 370952 sequences. (Running on oeis4.)