login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A245027 Divisors of 7^12 - 1. 3
1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 15, 16, 18, 19, 20, 24, 25, 26, 30, 32, 36, 38, 39, 40, 43, 45, 48, 50, 52, 57, 60, 65, 72, 75, 76, 78, 80, 86, 90, 95, 96, 100, 104, 114, 117, 120, 129, 130, 144, 150, 152, 156, 160, 171, 172, 180, 181, 190, 195, 200, 208 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Number of divisors of k^12-1 for k = 2..20: 24 (2), 80 (3), 96 (4), 240 (5), 128 (6), 864 (7), 512 (8), 384 (9), 256 (10), 1920 (11), 256 (12), 960 (13), 384 (14), 448 (15), 768 (16), 1792 (17), 768 (18), 3840 (19), 384 (20).

The following triangular numbers belong to this sequence: 1, 3, 6, 10, 15, 36, 45, 78, 120, 171, 190, 300, 325, 741, 780, 2080, 2850, 4560, 8385, 14706, 16290, 5915080, 1730160900.

LINKS

Bruno Berselli, Table of n, a(n) for n = 1..864

Index entries for sequences related to divisors of numbers

EXAMPLE

13841287200 = 2^5 * 3^2 * 5^2 * 13 * 19 * 43 * 181.

MATHEMATICA

Divisors[7^12 - 1]

PROG

(PARI) divisors(7^12-1)

(Sage) divisors(7^12-1)

(MAGMA) Divisors(7^12-1);

(Maxima) divisors(7^12-1);

CROSSREFS

Cf. Divisors of k^12-1: A003524 (k=2); A003532 (k=4); A003543 (k=8), A027902 (k=9), A027897 (k=10), A245028 (k=11).

Sequence in context: A225857 A168134 A245030 * A065108 A094563 A228897

Adjacent sequences:  A245024 A245025 A245026 * A245028 A245029 A245030

KEYWORD

nonn,fini,full

AUTHOR

Bruno Berselli, Jul 10 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 20 16:30 EDT 2019. Contains 327242 sequences. (Running on oeis4.)