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 A104607 Write the natural numbers in base 3 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal. 15
 1, 1, 1, 0, 1, 1, 1, 1, 2, 1, 2, 0, 1, 1, 0, 1, 1, 2, 0, 0, 1, 2, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 2, 1, 1, 2, 0, 0, 2, 2, 1, 2, 1, 2, 2, 2, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 2, 0, 1, 2, 2, 2, 0, 2, 2, 1, 0, 2, 2, 2, 0, 1, 2, 2, 2, 2, 1, 1, 0, 1, 1, 2, 0, 1, 1, 0, 2, 0, 0, 0, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,9 COMMENTS 1 21 011 1220 21221 001011... LINKS MATHEMATICA t = Flatten[IntegerDigits[Range[1000], 3]]; t[[Table[n(n + 1)/2, {n, 105}]]] CROSSREFS Cf. A104606, A104608, A104609, A104610, A104611, A104612, A104613, A091425, A104614, A104615, A104616, A104617, A104618, A104619, A104620. Sequence in context: A213890 A226460 A094114 * A120728 A092149 A171099 Adjacent sequences:  A104604 A104605 A104606 * A104608 A104609 A104610 KEYWORD base,nonn AUTHOR Robert G. Wilson v, Mar 16 2005 STATUS approved

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