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.

A077190 a(n) = A077189(n)/(2n-1).

Original entry on oeis.org

1, 4107, 0, 1763664903, 1369, 11, 949665717, 0
Offset: 1

Views

Author

Amarnath Murthy, Nov 01 2002

Keywords

Comments

a(5k+3) = 0. Are there any other values of n so that a(n) = 0?

Examples

			a(5) = 12321/9 = 1369.

Links

Crossrefs

Cf. A077180, A077181, A077182, A077183, A077184, A077186, A077188, A077189.

Extensions

a(7)-a(8) from Jinyuan Wang, Mar 04 2020

A120008 Smallest k such that the concatenation from 1 to k and back to 1 is divisible by 2n-1, or 0 if no such k exists.

Original entry on oeis.org

1, 3, 0, 6, 3, 2, 6, 0, 109, 103, 6, 100001, 0, 9, 1006, 17, 6, 0, 3, 6, 5, 103, 0, 1000002, 6, 129, 100012, 0
Offset: 1

Views

Author

Franklin T. Adams-Watters, Jun 02 2006

Keywords

Comments

a(29), 2n-1 = 57, is at least 1e8.

Crossrefs

Cf. A077189.
Showing 1-2 of 2 results.

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