A087251 - OEIS

A087251

Distinct largest-peak-values in 3x+1 trajectory arranged by their first appearance as initial value increases. A025586 without repetitions while keeping order.

1, 2, 16, 4, 52, 8, 40, 160, 88, 20, 64, 24, 9232, 32, 100, 112, 304, 196, 136, 48, 148, 232, 56, 184, 68, 208, 72, 340, 808, 80, 244, 84, 256, 592, 280, 96, 448, 104, 520, 116, 352, 628, 4372, 128, 132, 400, 916, 424, 144, 1024, 152, 472, 736, 168, 176, 532, 180

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..57.

EXAMPLE

peak=160 appears in trajectory started with n=15 and

before peaks = 1,2,16,4,52,8,40 appear at n=1,..,14

initial values: 160=a(8), the 8th new peak-value.

CROSSREFS

Cf. A025586.

Sequence in context: A232503 A348007 A025586 * A336833 A211367 A351585

Adjacent sequences: A087248 A087249 A087250 * A087252 A087253 A087254

KEYWORD

nonn

AUTHOR

Labos Elemer, Sep 08 2003

STATUS

approved