A091425 Write the natural numbers in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.

1, 3, 6, 1, 2, 5, 1, 2, 7, 2, 3, 4, 0, 7, 6, 7, 1, 0, 1, 6, 3, 1, 8, 6, 1, 3, 2, 1, 1, 1, 2, 2, 3, 2, 6, 8, 2, 3, 6, 3, 3, 7, 3, 6, 1, 3, 2, 8, 4, 1, 8, 4, 3, 1, 5, 8, 7, 6, 6, 6, 6, 7, 8, 7, 1, 3, 7, 8, 1, 8, 8, 2, 9, 1, 6, 1, 0, 7, 6, 8, 7, 1, 1, 1, 1, 2, 3, 5, 8, 3, 1, 1, 3, 3, 1, 4, 5, 4, 1, 1, 5, 0, 1, 4, 8

Offset

1,2

Comments

1

23

456

7891

01112

131415

1617181...

Links

Table of n, a(n) for n=1..105.

Mathematica

t = Flatten[IntegerDigits /@ Range[5565]]; t[[ Table[n(n + 1)/2, {n, 105}]]] (* Robert G. Wilson v, Feb 24 2005 *)

Crossrefs

Cf. A104606, A104607, A104608, A104609, A104610, A104611, A104612, A104613, A104614, A104615, A104616, A104617, A104618, A104619, A104620.

Sequence in context: A032660 A102257 A347196 * A369883 A205005 A113648

Adjacent sequences: A091422 A091423 A091424 * A091426 A091427 A091428

Keyword

base,easy,nonn

Author

J. Taylor (integersfan(AT)yahoo.com), Mar 02 2004

Status

approved