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.

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A068516 Number of squares (of another matrix) in the group GL(2,Z_n) described in sequence A000252.

Original entry on oeis.org

3, 16, 16, 162, 48, 696, 104, 1236, 486, 4680, 256, 9366, 2088, 2592, 1342, 28296, 3708, 44640, 2592, 11136, 14040, 97416, 1664, 100410, 28098, 99936, 11136, 250110, 7776, 327840, 20924, 74880, 84888, 112752, 19776, 671346, 133920, 149856, 16848
Offset: 2

Views

Author

Sharon Sela (sharonsela(AT)hotmail.com), Mar 19 2002

Keywords

Comments

The sequence is multiplicative. This is the 2-dimensional analog of A046073.

Crossrefs

Cf. A000252, A046073, A068197.

Extensions

Terms a(21) and beyond from Andrey Zabolotskiy, Jul 02 2022

A226757 a(n) = number of distinct quadruples of squares modulo n.

Original entry on oeis.org

1, 16, 16, 16, 81, 256, 256, 81, 256, 1296, 1296, 256, 2401, 4096, 1296, 256, 6561, 4096, 10000, 1296, 4096, 20736, 20736, 1296, 14641, 38416, 14641, 4096, 50625, 20736, 65536, 2401, 20736, 104976, 20736, 4096, 130321, 160000, 38416, 6561, 194481, 65536
Offset: 1

Views

Author

José María Grau Ribas, Jun 16 2013

Keywords

Crossrefs

Cf. A000224, A068197.

Formula

a(n) = A000224(n)^4. - Andrew Howroyd, Aug 06 2018

Extensions

Name corrected by Andrew Howroyd, Aug 06 2018
Showing 1-2 of 2 results.

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