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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

Table of n, a(n) for n=1..99.

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.)