A356184 Triangle read by rows: n-th row gives the indices of the n repunits that divide A340549(n).

1, 1, 2, 1, 2, 4, 1, 2, 3, 6, 1, 2, 3, 4, 6, 1, 2, 3, 4, 6, 12, 1, 2, 3, 4, 6, 8, 12, 1, 2, 3, 4, 5, 6, 10, 12, 1, 2, 3, 4, 5, 6, 8, 10, 12, 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 18, 20, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 18, 20, 24

Offset: 1

Author

Bernard Schott, Jul 28 2022

Keywords

• nonn
• base
• tabl

Examples

			Triangle begins:
  1;
  1,  2;
  1,  2,  4;
  1,  2,  3,  6;
  1,  2,  3,  4,  6;
  1,  2,  3,  4,  6, 12;
  1,  2,  3,  4,  6,  8, 12;
  1,  2,  3,  4,  5,  6, 10, 12;
  1,  2,  3,  4,  5,  6,  8, 10, 12;
  1,  2,  3,  4,  5,  6,  8,  9, 10, 12;
  1,  2,  3,  4,  5,  6,  8,  9, 10, 12, 18;
  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 12, 14;
  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 12, 14, 18;
  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 12, 14, 15, 18;
  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 12, 14, 15, 18, 20;
  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 12, 14, 15, 18, 20, 24;
  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 12, 14, 15, 16, 18, 20, 24;
  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 12, 14, 15, 16, 18, 20, 24, 30;
  ...
The 5th row is {1, 2, 3, 4, 6} since A340549(5) = 11222211 is the least integer that is divisible by five repunits and these are R_1, R_2, R_3, R_4 and R_6.
		

Crossrefs

Cf. A002275, A004023, A083230, A340549.