A119397 Numbers taking exactly 21 steps to reach 15 in A086793.

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

Offset: 1

Author

Zak Seidov, May 18 2006

Keywords

• base
• nonn

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).

Crossrefs

Cf. A086793, A119396-A119415.