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.

A162619 Triangle read by rows in which row n lists n consecutive natural numbers A000027, starting with A014689(n) = A000040(n)-n.

Original entry on oeis.org

1, 1, 2, 2, 3, 4, 3, 4, 5, 6, 6, 7, 8, 9, 10, 7, 8, 9, 10, 11, 12, 10, 11, 12, 13, 14, 15, 16, 11, 12, 13, 14, 15, 16, 17, 18, 14, 15, 16, 17, 18, 19, 20, 21, 22, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 25, 26, 27, 28, 29, 30, 31, 32, 33
Offset: 1

Views

Author

Omar E. Pol, Jul 10 2009

Keywords

Comments

Note that the last term of the n-th row is A000040(n)-1 = A006093(n).
See also A162618 and A162620.

Examples

			Triangle begins:
.1;
.1, 2;
.2, 3, 4;
.3, 4, 5, 6;
.6, 7, 8, 9,10;
.7, 8, 9,10,11,12;
10,11,12,13,14,15,16;
11,12,13,14,15,16,17,18;
14,15,16,17,18,19,20,21,22;
19,20,21,22,23,24,25,26,27,28;
20,21,22,23,24,25,26,27,28,29,30;

Crossrefs

Cf. A000040, A006093, A014689, A159797, A159798, A162611, A162618, A162620.

A162618 Triangle read by rows in which row n lists n consecutive natural numbers A000027, starting with A008578(n-1) - n + 1.

Original entry on oeis.org

1, 1, 2, 1, 2, 3, 2, 3, 4, 5, 3, 4, 5, 6, 7, 6, 7, 8, 9, 10, 11, 7, 8, 9, 10, 11, 12, 13, 10, 11, 12, 13, 14, 15, 16, 17, 11, 12, 13, 14, 15, 16, 17, 18, 19, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30
Offset: 1

Views

Author

Omar E. Pol, Jul 10 2009

Keywords

Comments

Note that the last term of the n-th row is the noncomposite number A008578(n-1).

Examples

			Contribution from _Omar E. Pol_, Jul 15 2009: (Start)
Triangle begins:
   1;
   1,  2;
   1,  2,  3;
   2,  3,  4,  5;
   3,  4,  5,  6,  7;
   6,  7,  8,  9, 10, 11;
   7,  8,  9, 10, 11, 12, 13;
  10, 11, 12, 13, 14, 15, 16, 17;
  11, 12, 13, 14, 15, 16, 17, 18, 19;
  14, 15, 16, 17, 18, 19, 20, 21, 22, 23;
  19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29;
  20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31;
(End)

Crossrefs

Cf. A000040, A008578, A159797, A159798, A162611, A162619, A162620.
Cf. A162614, A162622. - Omar E. Pol, Jul 15 2009

A162621 Triangle read by rows in which row n lists n consecutive natural numbers A000027, starting with A014689(n+1) = A000040(n+1)-n-1.

Original entry on oeis.org

1, 2, 3, 3, 4, 5, 6, 7, 8, 9, 7, 8, 9, 10, 11, 10, 11, 12, 13, 14, 15, 11, 12, 13, 14, 15, 16, 17, 14, 15, 16, 17, 18, 19, 20, 21, 19, 20, 21, 22, 23, 24, 25, 26, 27, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 25, 26, 27, 28, 29, 30, 31, 32, 33, 33, 34, 35, 28, 29, 30, 31, 32, 33, 34
Offset: 1

Views

Author

Omar E. Pol, Jul 10 2009

Keywords

Comments

Note that the last term of the n-th row is A000040(n+1)-2 = A040976(n+1).
See also A162618, A162619 and A162620.

Examples

			Triangle begins:
.1;
.2, 3;
.3, 4, 5;
.6, 7, 8, 9;
.7, 8, 9,10,11;
10,11,12,13,14,15;
11,12,13,14,15,16,17;
14,15,16,17,18,19,20,21;
19,20,21,22,23,24,25,26,27;
20,21,22,23,24,25,26,27,28,29;

Crossrefs

Cf. A000040, A014689, A040976, A159797, A159798, A162611, A162618, A162619, A162620.
Showing 1-3 of 3 results.

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