A085309 Initial values providing nontrivial cyclic attractor when function defined in A085307 is iterated.

213, 323, 639, 713, 1041, 1337, 1917, 2257, 3123, 3473, 4291, 5491, 5751, 6137, 9359, 9369, 15123, 16399, 17253, 19653, 22103, 28107, 30037

Offset

1,1

Comments

There could be terms missing from this list, although it is unlikely. The smallest number with unresolved status is 445. - Sean A. Irvine, Jun 14 2026

Links

Table of n, a(n) for n=1..23.

Example

n=213 gives {213,713,3123,3473,15123,713},
n=323 gives {323,1917,713,3123,3473,15123,713},
n=639 gives {639,713,3123,3473,15123,713}.

Crossrefs

Cf. A084317-A084319, A085307, A085308, A085309.

Sequence in context: A252025 A238019 A251146 * A252024 A302256 A092127

Adjacent sequences: A085306 A085307 A085308 * A085310 A085311 A085312

Keyword

base,nonn,more

Author

Labos Elemer, Jun 27 2003

Extensions

a(5)-a(23) from Sean A. Irvine, Jun 14 2026

Status

approved