cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-3 of 3 results.

A138846 Erroneous version of A138895.

Original entry on oeis.org

1, 2, 1, 4, 2, 1, 8, 4, 2, 1, 5, 8, 4, 2, 1, 3, 5, 8, 4, 2, 1, 6, 3, 5, 8, 4, 2, 1, 12, 6, 3, 5, 8, 4, 2, 1, 24, 12, 6, 3, 5, 8, 4, 2, 1, 17, 26, 13, 20, 10, 5, 8, 4, 2, 1, 11, 17, 26, 13, 20, 10, 5, 8, 4, 2, 1
Offset: 0

Views

Author

Paul Barry, Mar 31 2008, Apr 02 2008

Keywords

Comments

Former definition was: Triangle read by rows: T(n,k) = A092892(n-k) if k <= n, 0 otherwise.

Examples

			Triangle begins
   1;
   2,  1;
   4,  2,  1;
   8,  4,  2,  1;
   5,  8,  4,  2,  1;
   3,  5,  8,  4,  2,  1;
   6,  3,  5,  8,  4,  2,  1;
  12,  6,  3,  5,  8,  4,  2,  1;
  24, 12,  6,  3,  5,  8,  4,  2,  1;
  17, 26, 13, 20, 10,  5,  8,  4,  2,  1;
  11, 17, 26, 13, 20, 10,  5,  8,  4,  2,  1;
		

A138847 Row sums of a Collatz triangle.

Original entry on oeis.org

1, 3, 7, 15, 20, 23, 29, 41, 65, 82, 93, 100, 114, 123, 141, 177, 202, 251, 284, 349, 392, 478, 535, 574, 652, 805, 910, 1113, 1248, 1518, 1703, 1826, 2072, 2241, 2570, 2789, 2948, 3243, 3812, 4191, 4474, 4979, 5356, 5607, 5774, 5885, 6107
Offset: 0

Views

Author

Paul Barry, Mar 31 2008, Apr 02 2008

Keywords

Crossrefs

Partial sums of A092892.
Row sums of A138895.

Formula

a(n) = Sum_{k=0..n} A092892(k).
a(n) = Sum_{k=0..n} A138895(n,k).

A138848 Diagonal sums of a Collatz triangle.

Original entry on oeis.org

1, 2, 5, 10, 10, 13, 16, 25, 40, 42, 51, 49, 65, 58, 83, 94, 108, 143, 141, 208, 184, 294, 241, 333, 319, 486, 424, 689, 559, 959, 744, 1082, 990, 1251, 1319, 1470, 1478, 1765, 2047, 2144, 2330, 2649, 2707, 2900, 2874, 3011, 3096, 3455
Offset: 0

Views

Author

Paul Barry, Mar 31 2008, Apr 02 2008

Keywords

Comments

Diagonal sums of A138895.

Formula

a(n)=sum{k=0..floor(n/2), A092892(n-2k)}
Showing 1-3 of 3 results.