[seqfan] Re: More (composite) terms for A233281

David Wilson davidwwilson at comcast.net
Thu Feb 6 05:05:35 CET 2014


The following composite numbers up to 10^10 divide Fibonacci numbers of
prime index.
I believe this list to be complete.
It matches Han's list below up to 10^8.
Whoever is creating the sequence may use this as a b-file with my blessing.

1 4181
2 10877
3 75077
4 162133
5 330929
6 1256293
7 1346269
8 2662277
9 3636121
10 4226777
11 9401893
12 13455077
13 14787181
14 16485493
15 21692189
16 24157817
17 24493061
18 25532501
19 29604893
20 31432381
21 39247393
22 73780877
23 75245777
24 77337941
25 120485381
26 124477513
27 127835341
28 132162581
29 143221993
30 143548501
31 150204577
32 158197577
33 165580141
34 166850777
35 170371021
36 170434181
37 184135673
38 247030877
39 284344141
40 289140101
41 312189697
42 384646597
43 434916901
44 443146057
45 450825377
46 488248661
47 488458381
48 490536961
49 495101777
50 556753909
51 568148821
52 595402877
53 598147577
54 623709217
55 634002181
56 657665777
57 670786877
58 691543049
59 692726473
60 700190741
61 706840573
62 757968689
63 831065633
64 878330573
65 922483693
66 926408689
67 982540421
68 986079553
69 1137775913
70 1200060721
71 1345118777
72 1477519061
73 1577821261
74 1803510613
75 1958588417
76 1966151713
77 2075432497
78 2241989381
79 2252823569
80 2261715461
81 2372839153
82 2382397877
83 2390218553
84 2765307997
85 2793552613
86 2823296341
87 2836149397
88 2888781521
89 3065612489
90 3086561281
91 3136745501
92 3155957813
93 3234291377
94 3245777077
95 3303089189
96 3331524377
97 3334994153
98 3352947809
99 3602522773
100 3670694117
101 3741942101
102 3780533821
103 3797343377
104 3818616341
105 3909052421
106 3922272901
107 3923872577
108 4068854957
109 4205808769
110 4456556369
111 4484755277
112 4632976429
113 4746478769
114 4780078993
115 5180347577
116 5196007301
117 5498596277
118 5533355977
119 5605081357
120 5945029513
121 6052629001
122 6081535441
123 6174136433
124 6190228277
125 6336557533
126 6583494377
127 6889912577
128 7064945893
129 7215634537
130 7245906541
131 7289979377
132 7294465889
133 7487205461
134 7741101377
135 8495235377
136 8513443229
137 8674351753
138 8873687437
139 8892722617
140 8917517857
141 8970966377
142 9000721673
143 9093929861
144 9228113053
145 9655012897
146 9777337049
147 9823529269
148 9901504673

> -----Original Message-----
> From: SeqFan [mailto:seqfan-bounces at list.seqfan.eu] On Behalf Of Hans
> Havermann
> Sent: Monday, February 03, 2014 5:58 PM
> To: Sequence Fanatics Discussion list
> Subject: [seqfan] Re: More (composite) terms for A233281
> 
> "Numbers n such that the least Fibonacci number F_k which is a multiple of
n
> has a prime index, i.e. k is in A000040."
> 
> For those of us who think 'multiple' means more than one, 'positive
multiple'
> (or an example) might have cleared this up. Anyways, here are some
> additional values less than 10^8: 75077, 162133, 330929, 1256293, 1346269,
> 2662277, 3636121, 4226777, 9401893, 13455077, 14787181, 16485493,
> 21692189, 24157817, 24493061, 25532501, 29604893, 31432381, 39247393,
> 73780877, 75245777, 77337941.
> 
> 75077 is the only additional composite < 10^5. In the remaining range, I
don't
> know if there are other solutions.
> 
> 
> On Feb 1, 2014, at 9:08 PM, Antti Karttunen <antti.karttunen at gmail.com>
> wrote:
> 
> >> http://oeis.org/A233281 that I recently submitted: "Numbers n such that
> A001177(n) is prime."
> >> So far, only two composites there, 4181 and 10877, are known.
> 
> _______________________________________________
> 
> Seqfan Mailing list - http://list.seqfan.eu/



More information about the SeqFan mailing list