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.

A048188 a(n) = phi(n-th untouchable number).

Original entry on oeis.org

1, 4, 24, 40, 32, 32, 60, 72, 54, 92, 102, 48, 72, 96, 80, 120, 130, 132, 88, 96, 112, 144, 144, 96, 132, 108, 162, 96, 108, 120, 168, 128, 140, 168, 192, 232, 156, 164, 168, 216, 192, 208, 144, 176, 276, 280, 192, 288, 192, 192, 312, 312, 276, 332, 264, 232, 192
Offset: 1

Views

Author

Naohiro Nomoto

Keywords

Links

Crossrefs

Cf. A000010, A005114, A048189, A048190, A048191.

Formula

a(n) = A000010(A005114(n)).

Extensions

More terms from Amiram Eldar, Sep 23 2022

A048189 Let (u1,u2) be successive untouchable numbers such that phi(u1) = phi(u2); sequence gives values of u1.

Original entry on oeis.org

96, 292, 612, 626, 732, 1186, 1346, 1522, 1944, 2198, 3202, 3270, 3454, 3684, 3746, 4322, 5848, 5950, 6276, 6396, 6626, 7466, 7522, 7932, 7972, 8482, 8548, 8676, 12756, 12868, 13958, 15342, 15524, 15852, 15866, 17550, 17938, 18002, 18534, 19516, 20452, 22716
Offset: 1

Views

Author

Naohiro Nomoto

Keywords

Examples

			96 is a term since 96 and 120 are successive untouchable numbers and phi(96) = phi(120).
292 is a term since 292 and 304 are successive untouchable numbers and phi(292) = phi(304).

Links

Crossrefs

Cf. A000010, A005114, A048188, A048190, A048191.

Extensions

Offset changed to 1 and more terms from Michel Marcus, Jun 08 2015

A048190 Let (u1,u2) be successive untouchable numbers such that phi(u1) = phi(u2); sequence gives values of u2.

Original entry on oeis.org

120, 304, 624, 628, 738, 1192, 1348, 1528, 1956, 2212, 3208, 3276, 3476, 3708, 3748, 4336, 5876, 5952, 6282, 6402, 6632, 7468, 7528, 7944, 7976, 8488, 8552, 8688, 12762, 12872, 13972, 15348, 15536, 15858, 15868, 17556, 17944, 18008, 18552, 19520, 20464, 22734
Offset: 1

Views

Author

Naohiro Nomoto

Keywords

Examples

			120 is a term since 96 and 120 are successive untouchable numbers and phi(96) = phi(120).
304 is a term since 292 and 304 are successive untouchable numbers and phi(292) = phi(304).

Links

Crossrefs

Cf. A000010, A005114, A048188, A048189, A048191.

Extensions

Offset changed to 1 and more terms from Michel Marcus, Jun 08 2015
Showing 1-3 of 3 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.