筁祘い计Τ基
ま
讽ир计ぃ耞舼獽穦玻ネ笵计ョΤ计厩產癸计讽い计跑てΤ砍届
и 3n + 1瞦稱い 2005 ㄒ
2005 => 3008 => 1504 => 752 => 376 => 188 => 94 => 47 => 71 => 107 =>
161 => 242 => 121 => 182 => 91 => 137 => 206 => 103 => 155 => 233 =>
350 => 175 => 263 => 395 => 593 => 890 => 445 => 668 => 334 => 167 =>
251 => 377 => 566 => 283 => 425 => 638 => 319 => 479 => 719 => 1079 =>
1619 => 2429 => 3644 => 1822 => 911 => 1367 => 2051 => 3077 => 4616 => 2308 =>
1154 => 577 => 866 => 433 =>650 => 325 => 488 => 244 => 122 => 61 =>
92 => 46 => 23 => 35 => 53 => 80 => 40 => 20 => 10 => 5 =>
8 => 4 => 2 => 1
计患糤计
и笵讽い计Τ糤ョΤ搭ぶ璝赣计琌案计杠琌ゲ礛ゑㄓぶτ计计玥﹚ゑㄓ礛τ计㎝瞷计玥礚ゲ礛闽玒琌Τ计厩產р计い案计埃
2005 => 47 => 71 => 107 => 161 => 121 => 91 => 137 => 103 => 155 =>
233 => 175 => 263 => 395 => 593 => 445 => 167 => 251 => 377 => 283 =>
425 => 319 => 479 => 719 => 1079 => 1619 => 2429 => 911 => 1367 => 2051 =>
3077 => 577 => 433 => 325 => 61 => 23 => 35 => 53 => 5 => 1
讽いиぃ螟тㄇ患糤计计 319 => 479 => 719 => 1079 => 1619 => 2429 の 175 => 263 => 395 => 593 单┏硂贺计Τ㎡琌ぃ琌ヴ计患糤计
氮﹚璸衡獽惧
砞俱计 n = a * 2k - 1ㄤい a 计 k > 1玥 n ョ计
珿跑传穝
(3n + 1) / 2
= [3 *( a * 2k - 1) + 1] / 2
= [3a * 2k - 3 + 1] / 2
= [3a * 2k - 2] / 2
= 3a * 2k - 1 - 1
计计讽 k - 1 > 0 璝Ω跑传珿璝琘计Τ 2 5Ωよ玥ㄤ玻ネ 4 Ω跑传硈玥Τ5 患糤计パ k ヴ種珿ヴ種计患糤计
は崩筁祘
セ刚瓜р┮Τ计计糶ㄓΤㄇ祇瞷
1 <= 5 <= 3
1 <= 5 <= 13 <= 17 <= 11 <= 7 <= 9
1 <= 5 <= 13 <= 17 <= 11 <= 7 <= 37 <= 49 <= 65 <= 43 <= 57
1<= 21
1<= 85 <= 113 <= 75
硂ㄠ糶ㄤい场よ猭琌 1 は崩簍 5 ┪ 21 竒筁跑传计琌 1 9 跑传琌 7
и┮Τ 3 计⊿猭崩琌弧ぃ穦Τ计竒筁跑传穦跑Θ 3 计计
虏虫璝赣计 3 计ㄤ计琌 3 计ぃ穦琌 3N + 1
璝琘计 n = 3k + 1 玥ㄤ崩计 (4n - 1) / 3璝琘计 n = 3k + 2玥ㄤ崩计 (2n - 1) / 3
琘计 n 竒筁跑传Θ k玥 4n + 1 Τ妓挡狦 5, 21, 85 穦跑Θ 1 ㄤ龟 4 * 85 + 1 = 341 琌妓
硂ㄇ挡阶癸靡瞦稱ゼゲΤノ度妮甌и獺 5n + 1 ┪ 7n + 1 柑ぃ琌硂或虏虫は崩┪计ぇ丁丁玒穦狡馒