[seqfan] Re: Sloane's Sequence A023052

[Richard Mathar]

In http://list.seqfan.eu/pipermail/seqfan/2009-June/001669.html we read

dw> David Wilson davidwwilson at comcast.net
dw> Mon Jun 15 03:03:55 CEST 2009
dw> 
dw> The short answer is no, we do not know whether A023052 is finite.
dw> <snip>
dw> 
dw> At one time, Gusev had a list of all elements of A023052 up to 10^50 online. At that time, the OEIS did not include b-files, or I would probably have copied this list to the OEIS. By the time b-files were establish, Gusev's list had disappeared and I have not been able to find it.
dw> 


Up to and including 13-digits numbers, A023052 is

1 0
2 1
3 2
4 3
5 4
6 5
7 6
8 7
9 8
10 9
11 153
12 370
13 371
14 407
15 1634
16 4150
17 4151
18 8208
19 9474
20 54748
21 92727
22 93084
23 194979
24 548834
25 1741725
26 4210818
27 9800817
28 9926315
29 14459929
30 24678050
31 24678051
32 88593477
33 146511208
34 472335975
35 534494836
36 912985153
37 4679307774
38 32164049650
39 32164049651
40 40028394225
41 42678290603
42 44708635679
43 49388550606
44 82693916578
45 94204591914
46 564240140138

Because there are no 13-digits members, the last one in this list has only
12 digits, in fact.
This is my independent calculation which agrees with the list of
http://eugen.leitl.org/postbiota/extropy/extropy-chat/2004-February/003982.html

I guess more numbers can be taken from
http://bbs.emath.ac.cn/viewthread.php?action=printable&tid=1104

Richard Mathar