A175490 - cp's OEIS frontend

A175490 a(n) = Product_{k=1..n} b(k,n), where b(k,n) is the largest positive integer that, when written in binary, occurs as a substring in both binary k and binary n.

n	a(n)
1	1
2	2
3	3
4	8
5	20
6	144
7	63
8	256
9	1152
10	1600
11	118800
12	995328
13	8424000
14	12192768
15	178605
16	1048576
17	8912896
18	21233664
19	27572576256
20	13107200000
21	537600000
22	2032335360000
23	30928035600000
24	760840571584512
25	13541327555788800

[1, 2, 3, 8, 20, 144, 63, 256, 1152, 1600, 118800, 995328, 8424000, 12192768, 178605, 1048576, 8912896, 21233664, 27572576256, 13107200000, 537600000, 2032335360000, 30928035600000, 760840571584512, 13541327555788800]

cp's OEIS Frontend

A175490 a(n) = Product_{k=1..n} b(k,n), where b(k,n) is the largest positive integer that, when written in binary, occurs as a substring in both binary k and binary n.

Table of values

List of values