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A119397 Numbers taking exactly 21 steps to reach 15 in A086793. 2
71820, 103950, 127764, 135660, 141360, 161460, 173250, 183744, 193284, 203580, 206712, 209440, 214830, 217620, 221760, 223020, 223860, 234432, 243540, 244440, 246330, 247752, 256680, 263160, 264180, 265200, 280368, 281160, 286380, 287712 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Some trajectories are: 71820,1104,168,102,36,46,18,30,27,22,9,13,5,6,12,19,11,3,4,7,8,15 103950,1134,168,... 127764,924,168,... 135660,1134,168,... 221760,1908,162,66,36,... 343728,1650,162,... 376992,2016,297,66,36,... All trajectories eventually join one of previous trajectories. In the first 136 terms <800000 there is only one odd number, 628425. Next odd terms are: 824175, 1340325, 1422135, 1495725 (see A119398).

LINKS

Table of n, a(n) for n=1..30.

CROSSREFS

Cf. A086793, A119396-A119415.

Sequence in context: A031865 A283955 A114661 * A025300 A025319 A097245

Adjacent sequences:  A119394 A119395 A119396 * A119398 A119399 A119400

KEYWORD

base,nonn

AUTHOR

Zak Seidov, May 18 2006

STATUS

approved

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Last modified January 18 16:27 EST 2020. Contains 331011 sequences. (Running on oeis4.)