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 A104618 Write the natural numbers in base 15 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, 1, 6, 10, 2, 2, 10, 1, 3, 4, 7, 0, 5, 6, 12, 7, 8, 8, 10, 7, 11, 12, 1, 0, 1, 1, 1, 1, 1, 3, 1, 1, 5, 1, 1, 8, 1, 1, 11, 1, 1, 14, 2, 2, 2, 2, 2, 5, 2, 2, 9, 2, 2, 13, 2, 3, 2, 3, 3, 6, 3, 3, 10, 3, 3, 0, 4, 4, 5, 4, 4, 10, 4, 4, 0, 5, 5, 5, 5, 5, 11, 5, 6, 2, 6, 6, 8, 6, 6, 14, 7, 7, 5, 7, 7 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 1 23 456 789A BCDE1 011121... LINKS MATHEMATICA t = Flatten[ IntegerDigits[ Range[1900], 15]]; t[[Table[n(n + 1)/2, {n, 100}]]] CROSSREFS Cf. A104606, A104607, A104608, A104609, A104610, A104611, A104612, A104613, A091425, A104614, A104615, A104616, A104617, A104619, A104620. Sequence in context: A115251 A057241 A104617 * A104616 A104614 A133302 Adjacent sequences:  A104615 A104616 A104617 * A104619 A104620 A104621 KEYWORD base,nonn AUTHOR Robert G. Wilson v, Mar 16 2005 STATUS approved

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Last modified March 23 02:42 EDT 2019. Contains 321422 sequences. (Running on oeis4.)