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 1-3 of 3 results.

A115914 Numbers k such that k + sigma(k) is a brilliant number (A078972).

Original entry on oeis.org

7, 17, 50, 71, 93, 117, 149, 187, 201, 217, 221, 247, 256, 263, 265, 327, 329, 371, 381, 383, 385, 389, 392, 401, 403, 413, 427, 449, 461, 485, 497, 503, 515, 525, 533, 543, 569, 605, 623, 635, 649, 667, 685, 701, 723, 763, 803, 821, 831, 835, 837, 839
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Examples

			sigma(117) + 117 = 299 = 13*23.

Crossrefs

Cf. A078972, A115916.

A115915 Numbers k such that k + phi(k) is a brilliant number (A078972).

Original entry on oeis.org

4, 5, 9, 10, 11, 13, 61, 87, 127, 181, 241, 253, 265, 287, 295, 321, 323, 349, 361, 363, 377, 397, 407, 409, 421, 451, 457, 473, 481, 485, 511, 515, 527, 537, 541, 581, 595, 631, 635, 671, 695, 705, 721, 731, 751, 757, 763, 769, 793, 805, 807, 843, 851, 867
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Examples

			295 + phi(295) = 527 = 17*31.

Crossrefs

Cf. A078972, A115916.

A115917 Numbers k such that sigma(k) - phi(k) is a brilliant number (A078972).

Original entry on oeis.org

6, 10, 49, 242, 289, 512, 578, 800, 900, 1250, 2048, 5041, 15625, 17424, 22201, 22472, 26450, 28900, 48400, 60025, 62001, 65536, 69169, 91592, 131072, 144722, 146689, 151321, 160801, 201601, 212521, 236196, 242064, 252050, 253009
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Examples

			sigma(62001) - phi(62001) = 49813 = 109*457.

Crossrefs

Cf. A078972, A115916.
Showing 1-3 of 3 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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