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.

A152482 Even numbers which are not the sum of 2 even semiprimes.

Original entry on oeis.org

2, 4, 6, 22, 34, 46, 54, 58, 70, 74, 82, 94, 102, 106, 114, 118, 130, 134, 142, 154, 158, 166, 174, 178, 186, 190, 194, 202, 214, 226, 234, 238, 242, 246, 250, 254, 262, 270, 274, 286, 290, 294, 298, 310, 314, 322, 326, 334, 342, 346, 354, 358, 370, 374, 378
Offset: 1

Views

Author

Donovan Johnson, Dec 06 2008

Keywords

Comments

Twice A014092. [From Omar E. Pol, Dec 26 2008]

Examples

			102 is in this sequence because no 2 even semiprimes sum to 102. 104 is not in this sequence because the sum of 10 (even semiprime) and 94 (even semiprime) is 104.

Crossrefs

Cf. A001358, A100484, A152483, A152484.
Cf. A014092. [From Omar E. Pol, Dec 26 2008]

Formula

a(n) = A014092(n)*2. [From Omar E. Pol, Dec 26 2008]

A152483 Even numbers which are not the sum of 2 odd semiprimes.

Original entry on oeis.org

2, 4, 6, 8, 10, 12, 14, 16, 20, 22, 26, 28, 32, 38, 52, 62
Offset: 1

Views

Author

Donovan Johnson, Dec 06 2008

Keywords

Comments

No more terms < 10^9. Conjectured to be complete.

Examples

			62 is in this sequence because no 2 odd semiprimes sum to 62. 64 is not in this sequence because the sum of 9 (odd semiprime) and 55 (odd semiprime) is 64.

Crossrefs

Cf. A118081, A046315, A152482, A152484.
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.