A177416 Triangle read by rows: T(n,k) = 2^A141468(n) mod prime(k).

1, 0, 2, 0, 1, 1, 0, 1, 4, 1, 0, 1, 1, 4, 3, 0, 2, 2, 1, 6, 5, 0, 1, 4, 2, 1, 10, 4, 0, 1, 1, 1, 4, 1, 16, 11, 0, 1, 4, 4, 5, 4, 13, 6, 8, 0, 2, 3, 1, 10, 8, 9, 12, 16, 27, 0, 1, 1, 2, 9, 3, 1, 5, 9, 25, 2, 0, 1, 4, 1, 3, 12, 4, 1, 13, 13, 8, 36, 0, 1, 1, 4, 1, 9, 16, 4, 6, 23, 1, 33, 1, 0, 2, 2, 1, 2, 5, 15, 8, 12, 17, 2, 29, 2, 42

Offset

1,3

Links

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

Example

The triangle begins at row n = 1 with columns 1 <= k <= n:
  1;
  0, 2;
  0, 1, 1;
  0, 1, 4, 1;
  0, 1, 1, 4, 3;
  0, 2, 2, 1, 6, 5;

Mathematica

MapIndexed[PowerMod[2, #, Prime[Range[First[#2]]]] &, Join[{0, 1}, Select[Range[25], CompositeQ]]] (* Paolo Xausa, Jul 01 2024 *)

Crossrefs

Cf. A000079, A141468, A174620.

Sequence in context: A374058 A378068 A216266 * A087606 A271368 A116799

Adjacent sequences: A177413 A177414 A177415 * A177417 A177418 A177419

Keyword

nonn,tabl,easy

Author

Juri-Stepan Gerasimov, Dec 10 2010

Extensions

A 23 replaced with 33 by R. J. Mathar, Dec 13 2010

Status

approved