[seqfan] Re: a(n) divides A000201(a(n))^m
Sean A. Irvine
sairvin at xtra.co.nz
Mon Jan 31 22:32:17 CET 2011
Paul,
Below are what I get for the first 100 terms. I concur with your values.
If n = p_1^{e_1} p_2^{e_2} ... p_r^{e_r}, then require
p_1p_2...p_r | A000201(a(n)). Thus value for SEQ.(3) is certainly
below max{e_1,e_2,...e_r} at each point.
SEQ.(1) SEQ.(2) SEQ.(3)
1 1 1 1
2 4 6 2
3 8 12 2
4 25 40 2
5 50 80 2
6 108 174 3
7 169 273 2
8 243 393 5
9 256 414 8
10 338 546 2
11 486 786 5
12 512 828 5
13 729 1179 3
14 768 1242 8
15 972 1572 5
16 1024 1656 4
17 1156 1870 2
18 1215 1965 5
19 2312 3740 2
20 3375 5460 3
21 5000 8090 4
22 7921 12816 2
23 8192 13254 13
24 8748 14154 7
25 10000 16180 4
26 12800 20710 9
27 15000 24270 4
28 15842 25632 2
29 20000 32360 4
30 25000 40450 3
31 50176 81186 10
32 54289 87841 2
33 85184 137830 6
34 88209 142725 6
35 100352 162372 6
36 104976 169854 8
37 108578 175682 2
38 131072 212078 17
39 176418 285450 6
40 177147 286629 11
41 248832 402618 10
42 264627 428175 4
43 320000 517770 9
44 350464 567062 8
45 352836 570900 6
46 366025 592240 4
47 372100 602070 2
48 441045 713625 6
49 460800 745590 11
50 472392 764346 10
51 529254 856350 4
52 744200 1204140 2
53 820125 1326990 8
54 823543 1332520 7
55 900000 1456230 5
56 921600 1491180 6
57 944784 1528692 10
58 1382400 2236770 11
59 1417176 2293038 6
60 1556068 2517770 3
61 1577536 2552506 6
62 1640250 2653980 8
63 1843200 2982360 5
64 1854944 3001362 5
65 2088025 3378495 4
66 2109375 3413040 7
67 2175625 3520235 4
68 2304000 3727950 11
69 2460375 3980970 5
70 2550409 4126648 2
71 2764800 4473540 6
72 3225600 5219130 11
73 3280500 5307960 8
74 3341637 5406882 5
75 3686400 5964720 4
76 3709476 6002058 4
77 3709888 6002724 3
78 4100625 6634950 8
79 4147200 6710310 11
80 4176050 6756990 4
81 4194304 6786526 22
82 4218750 6826080 7
83 4351250 7040470 4
84 4608000 7455900 6
85 4920750 7961940 5
86 5068800 8201490 11
87 5100818 8253296 2
88 5529600 8947080 5
89 5740875 9288930 8
90 5990400 9692670 11
91 6451200 10438260 6
92 6526875 10560705 4
93 6683274 10813764 5
94 6912000 11183850 11
95 7372800 11929440 3
96 7418952 12004116 4
97 7812500 12640890 9
98 8388608 13573052 12
99 8680203 14044863 11
100 8702500 14080940 4
Sean.
Paul D Hanna wrote:
> SeqFans,
> Would someone extend/verify these sequences?
> Below, a(n) refers to the terms in SEQ.1.
>
> SEQ. (1)
> a(n) divides A000201(a(n))^m for some integer m>0, where A000201 is the lower Wythoff sequence.
>
> 1,4,8,25,50,108,169,243,256,338,486,512,729,768,972,1024,1156,1215,
> 2312,3375,5000,7921,8192,8748,10000,12800,15000,15842,20000,25000,
>
> Many of these terms are powers of fibonacci numbers.
> Perhaps this is expected, since these involve floor(a(n)*phi).
>
> SEQ. (2)
> A000201(a(n))
>
> 1,6,12,40,80,174,273,393,414,546,786,828,1179,1242,1572,1656,1870,1965,
> 3740,5460,8090,12816,13254,14154,16180,20710,24270,25632,32360,40450,
>
> SEQ. (3)
> Least m for which a(n) divides A000201(a(n))^m.
>
> 1,2,2,2,2,3,2,5,8,2,5,5,3,8,5,4,2,5,2,3,4,2,13,7,4,9,4,2,4,3,
>
> Question: is m always <= n ?
>
> Thanks,
> Paul
>
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