A174699 Triangle read by rows: T(n,k) = 2^(2n) mod (2k+1).

0, 0, 1, 0, 1, 1, 0, 1, 4, 1, 0, 1, 1, 4, 4, 0, 1, 4, 2, 7, 1, 0, 1, 1, 1, 1, 4, 1, 0, 1, 4, 4, 4, 5, 4, 4, 0, 1, 1, 2, 7, 9, 3, 1, 1, 0, 1, 4, 1, 1, 3, 12, 4, 4, 1, 0, 1, 1, 4, 4, 1, 9, 1, 16, 4, 4

Offset

0,9

Links

Table of n, a(n) for n=0..65.

Example

The triangle starts at row n = 0 with columns 0 <= k <= n:
  0;
  0, 1;
  0, 1, 1;
  0, 1, 4, 1;
  0, 1, 1, 4, 4;
  0, 1, 4, 2, 7, 1;
  0, 1, 1, 1, 1, 4, 1;
  0, 1, 4, 4, 4, 5, 4, 4;

Mathematica

Array[PowerMod[2, 2*#, Range[1, 2*#+1, 2]] &, 15, 0] (* Paolo Xausa, Jun 29 2024 *)

Crossrefs

Cf. A005408, A005843.

Sequence in context: A334429 A295281 A256461 * A213027 A347618 A290459

Adjacent sequences: A174696 A174697 A174698 * A174700 A174701 A174702

Keyword

nonn,tabl,easy

Author

Juri-Stepan Gerasimov, Nov 30 2010

Status

approved