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

339026688000000, 377975808000000, 424639621324800, 483184764518400, 453984583680000

Offset

1,1

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.

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

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

Sequence in context: A172592 A082589 A371834 * A239922 A011528 A172542

Adjacent sequences: A375009 A375010 A375011 * A375013 A375014 A375015

Keyword

nonn,fini,full

Author

Jud McCranie, Jul 27 2024

Status

approved