A308765 Irregular triangle T(n,k) read by rows with 1 <= k <= A091887 even indices 2i such that n-th irregular prime p (A000928) divides the numerator of the Bernoulli numbers B_{2i} (A000367) with 0 <= 2i <= p-3.

32, 44, 58, 68, 24, 22, 130, 62, 110, 84, 164, 100, 84, 20, 156, 88, 292, 280, 186, 300, 100, 174, 200, 382, 126, 240, 366, 196, 130, 94, 194, 292, 336, 338, 400, 86, 270, 486, 222, 52, 90, 92, 22, 592, 522, 20, 174, 338, 428, 80, 226, 236, 242, 554, 48, 224, 408, 502, 628, 32, 12, 200, 378, 290, 514, 260, 732, 220, 330, 628, 544, 744, 102, 66, 868, 162, 418, 520, 820, 156, 166

Offset

1,1

Comments

First index T(n,1) in row n is A035112(n).

Links

Table of n, a(n) for n=1..81.

Example

Triangle starts with
n = 1 => p = 37 divides the numerator of B_{32} = -7709321041217;
n = 2 => p = 59: B_{44};
n = 3 => p = 67: B_{58};
n = 4 => p = 101: B_{68};
n = 5 => p = 103: B_{24};
n = 6 => p = 131: B_{22};
n = 7 => p = 149: B_{130};
n = 8 => p = 157: B_{62}, B_{110};
n = 9 => p = 233: B_{84};
etc.

Maple

T:=[]:
for j from 2 to 168 do
  p:=ithprime(j);
  B:=[]:
  for i from 1 to (p-3)/2 do
    if type(numer(bernoulli(2*i))/p, integer) then B:=[op(B), 2*i]: fi:
  od:
  T:=[op(T), op(B)];
od:
op(T);

Crossrefs

Cf. A000367, A000928, A035112, A060974, A060975, A073276, A073277, A091887.

Sequence in context: A269230 A229115 A035112 * A236324 A211813 A353234

Adjacent sequences: A308762 A308763 A308764 * A308766 A308767 A308768

Keyword

nonn,tabf

Author

Martin Renner, Jun 23 2019

Status

approved