A340419 Trajectory of 397 under the map A340008: n -> n/2 if n is even, n-> n^2 - 1 if n is an odd prime, otherwise n -> n - 1.

397, 157608, 78804, 39402, 19701, 19700, 9850, 4925, 4924, 2462, 1231, 1515360, 757680, 378840, 189420, 94710, 47355, 47354, 23677, 560600328, 280300164, 140150082, 70075041, 70075040, 35037520, 17518760, 8759380, 4379690, 2189845, 2189844, 1094922, 547461

Offset

0,1

Comments

It is not known if this sequence reaches the value 1 and stops, or if it enters a cycle or diverges.

Links

Rémy Sigrist, Table of n, a(n) for n = 0..3998

Example

a(0) = 397 is an odd prime, so a(1) = 397^2 - 1 = 157608.
a(1) = 157608 is even, so a(2) = a(1)/2 = 78804.

Prog

(PARI) v=397; for (n=1, 32, print1 (v", "); v=if (v%2==0, v/2, isprime(v), v^2-1, v-1))

Crossrefs

Cf. A339991, A340008.

Sequence in context: A152309 A298124 A327592 * A191942 A158316 A236713

Adjacent sequences: A340416 A340417 A340418 * A340420 A340421 A340422

Keyword

nonn,easy,look

Author

Rémy Sigrist, Jan 07 2021

Status

approved