A104612 Write the natural numbers in base 8 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.

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

Offset

1,2

Comments

1

23

456

7101

11213

141516...

Links

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

Mathematica

t = Flatten[ IntegerDigits[ Range[1750], 8]]; t[[Table[n(n + 1)/2, {n, 105}]]]
TakeList[Flatten[IntegerDigits[Range[3000], 8]], Range[150]][[All, -1]] (* Harvey P. Dale, Nov 06 2022 *)

Crossrefs

Cf. A104606, A104607, A104608, A104609, A104610, A104611, A104613, A091425, A104614, A104615, A104616, A104617, A104618, A104619, A104620.

Sequence in context: A369883 A205005 A113648 * A088392 A195699 A199795

Adjacent sequences: A104609 A104610 A104611 * A104613 A104614 A104615

Keyword

base,nonn

Author

Robert G. Wilson v, Mar 16 2005

Status

approved