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 1-2 of 2 results.

A168544 The nonprime halfs of even single (or even isolated) numbers.

Original entry on oeis.org

1, 6, 9, 15, 21, 30, 36, 51, 54, 69, 75, 90, 96, 99, 114, 120, 135, 141, 156, 174, 210, 216, 231, 261, 285, 300, 309, 321, 330, 405, 411, 414, 429, 441, 510, 516, 525, 531, 546, 576, 615, 639, 645, 651, 639, 645, 651, 660, 714, 726, 741, 744, 804, 810, 834, 849
Offset: 1

Views

Author

Juri-Stepan Gerasimov, Nov 29 2009

Keywords

Crossrefs

Cf. A008486, A040040, A141468, A168497.

A171433 n-th half of even single (or even isolated) numbers plus n-th half of even non-single (or even nonisolated) numbers.

Original entry on oeis.org

1, 6, 8, 13, 17, 25, 32, 42, 49, 65, 70, 86, 93, 109, 116, 121, 137, 144, 160, 167, 183, 202, 239, 247, 263, 294, 319, 335, 346, 359, 369, 445, 452, 456, 472, 485, 555, 562, 572, 579, 595, 626, 667, 692, 700, 707, 717, 772, 785, 801, 805, 866, 873, 898, 914
Offset: 1

Views

Author

Juri-Stepan Gerasimov, Dec 09 2009

Keywords

Examples

			a(1)=1+0=1, a(2)=2+4=6, a(3)=3+5=8.

Crossrefs

Cf. A167706(the single or isolated numbers), A167707(the non-single or nonisolatred numbers), A168044, A168497.

Formula

a(n)=A168497(n)+A168044(n).

Extensions

Entries checked by R. J. Mathar, May 23 2010
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.