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.

A375012 A cycle of length 5 when iterating x <- phi(sigma(x)).

Original entry on oeis.org

339026688000000, 377975808000000, 424639621324800, 483184764518400, 453984583680000
Offset: 1

Views

Author

Jud McCranie, Jul 27 2024

Keywords

Comments

The first term in the sequence is the smallest member of the cycle. This is the 5-cycle with the smallest members. Similar cycles are in the crossreferences.

Examples

			phi(sigma(339026688000000)) = 377975808000000, ... phi(sigma(453984583680000)) = 339026688000000, so 339026688000000 is in the sequence.

Crossrefs

Cf. A095955, A095956, A001229, A373435, A373453, A373454, A375013, A375014.

A375013 A cycle of length 6 when iterating x <- phi(sigma(x)).

Original entry on oeis.org

1800, 2880, 3024, 3840, 3456, 2560
Offset: 1

Views

Author

Jud McCranie, Jul 27 2024

Keywords

Comments

The first term in the sequence is the smallest member of the cycle. This is the 6-cycle with the smallest members. Similar cycles are in the crossreferences.

Examples

			phi(sigma(1800)) = 2880, ... phi(sigma(2560)) = 1800, so 1800 is in the sequence.

Crossrefs

Cf. A095955, A095956, A001229, A373435, A373453, A373454, A375012, A375014.

A375122 A cycle of length 5 when iterating x <- phi(sigma(x)).

Original entry on oeis.org

6634509269055173050761216000, 7521613519844726223667200000, 7946886558074859593662464000, 7794495412499746337587200000, 7970172471593905204651622400
Offset: 1

Views

Author

Jud McCranie, Jul 30 2024

Keywords

Comments

The first term is the smallest member of the cycle. Another cycle with length 5 is A375012.

Crossrefs

Cf. A095955, A095956, A001229, A373435, A373453, A373454, A375012, A375013, A375014.
Showing 1-3 of 3 results.

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