# A152990: Sum of proper divisors minus the number of proper divisors of Fibonacci number A000045(n).
# Table of n, a(n) for n = 1..80
# a(79-80) corrected by Georg Fischer, Feb 18 2020 with (Maple):
# with(combinat): with(numtheory): seq(sigma(fibonacci(n))-fibonacci(n)-tau(fibonacci(n))+1, n = 1 .. 80); # _Emeric Deutsch_, Jan 02 2009
1 0
2 0
3 0
4 0
5 0
6 4
7 0
8 8
9 17
10 14
11 0
12 245
13 0
14 40
15 499
16 542
17 0
18 2801
19 148
20 5316
21 6771
22 286
23 0
24 110809
25 18032
26 752
27 124327
28 155934
29 0
30 1310617
31 2972
32 1213164
33 1821955
34 5166
35 2697336
36 33280689
37 506376
38 1416024
39 32030851
40 106878198
41 62156
42 295708841
43 0
44 274335236
45 1063567695
46 17287530
47 0
48 11990512753
49 684728064
50 4727729904
51 10201638387
52 11257501230
53 55946692
54 99131708601
55 30055411700
56 165819223468
57 203237589679
58 10053832114
59 2710261048
60 4549796958577
61 555008008
62 8957137512
63 4685115907951
64 5928096489222
65 3521953273876
66 25163549044649
67 167501530140
68 25779137874836
69 60353386851855
70 91498522595058
71 46165377744
72 1451980584573601
73 95396544
74 27354085383728
75 1881590310358967
76 1303840362406862
77 492122969280268
78 8164277999600409
79 92180471494908
80 25521744587250716