A104609 Write the natural numbers in base 5 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.

1, 3, 0, 2, 2, 2, 1, 0, 1, 0, 1, 1, 3, 1, 2, 1, 2, 2, 4, 3, 3, 3, 4, 4, 3, 0, 0, 0, 4, 1, 2, 0, 1, 2, 2, 3, 2, 1, 3, 3, 2, 2, 1, 1, 4, 2, 0, 2, 2, 1, 4, 0, 4, 3, 3, 2, 3, 3, 4, 4, 2, 4, 2, 3, 4, 3, 4, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 4, 2, 1, 1, 2, 2, 3, 1, 1, 3, 1, 4, 1, 1, 4, 1, 4, 1, 2

Offset

1,2

Comments

1

23

410

1112

13142

021222...

Links

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

Mathematica

t = Flatten[IntegerDigits[Range[1500], 5]]; t[[Table[n(n + 1)/2, {n, 105}]]]

Crossrefs

Cf. A104606, A104607, A104608, A104610, A104611, A104612, A104613, A091425, A104614, A104615, A104616, A104617, A104618, A104619, A104620.

Sequence in context: A102003 A176314 A004587 * A326395 A290566 A285006

Adjacent sequences: A104606 A104607 A104608 * A104610 A104611 A104612

Keyword

base,nonn

Author

Robert G. Wilson v, Mar 16 2005

Status

approved