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 1-1 of 1 results.

A117311 Beginning with sequence A096903, choose only those rows such that when a(n) is in factored form all exponents of a(n) are consecutive starting at 1.

Original entry on oeis.org

2, 6, 12, 18, 30, 60, 90, 150, 180, 300, 450, 210, 360, 540, 600, 1350, 1500, 2250, 420, 630, 1050, 1470, 1260, 2100, 2940, 3150, 4410, 7350, 2310, 2520, 3780, 4200, 5880, 9450, 10500, 13230, 15750, 20580, 30870, 36750, 51450, 4620, 6930, 11550, 16170
Offset: 1

Views

Author

Alford Arnold, Mar 07 2006

Keywords

Comments

Included rows can be mapped to permutation groups; e.g. - (12,18) to C2; (60,90,150) and (180,300,450) to C3; (360,540,600,1350,1500,2250) to S3; and (420,630,1050,1470) to C4.

Examples

			10 is not a member of a(n) since it is not a term in A096903.
24 is not a member of a(n) since 24 = 2^3 * 3^1 and exponents 1 & 3 are not consecutive.
12, 60 and 180 are included since the exponents are (2,1), (2,1,1) & (2,2,1) respectively.

Crossrefs

Cf. A055932 A084918 A096903.

Extensions

More terms from Franklin T. Adams-Watters, Nov 20 2006
Showing 1-1 of 1 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.