A278048 - cp's OEIS frontend

A278048 Let v = list of denominators of Farey series of order n (see A006843); let b(n) = Sum 1/(kk'(k+k')), where (k,k') are pairs of successive terms of v; a(n) = denominator of b(n).

n	a(n)
1	2
2	3
3	30
4	21
5	252
6	396
7	6435
8	858
9	2042040
10	3527160
11	5290740
12	9360540
13	1029659400
14	617795640
15	116454478140
16	1061790830100
17	283144221360
18	10644519600
19	14060345939640
20	14060345939640
21	2960272834318800
22	130015019445168
23	4653946718775900
24	43747099156493460

[2, 3, 30, 21, 252, 396, 6435, 858, 2042040, 3527160, 5290740, 9360540, 1029659400, 617795640, 116454478140, 1061790830100, 283144221360, 10644519600, 14060345939640, 14060345939640, 2960272834318800, 130015019445168, 4653946718775900, 43747099156493460]

cp's OEIS Frontend

A278048 Let v = list of denominators of Farey series of order n (see A006843); let b(n) = Sum 1/(kk'(k+k')), where (k,k') are pairs of successive terms of v; a(n) = denominator of b(n).

Table of values

List of values

cp's OEIS Frontend

A278048 Let v = list of denominators of Farey series of order n (see A006843); let b(n) = Sum 1/(k*k'*(k+k')), where (k,k') are pairs of successive terms of v; a(n) = denominator of b(n).

Table of values

List of values

A278048 Let v = list of denominators of Farey series of order n (see A006843); let b(n) = Sum 1/(kk'(k+k')), where (k,k') are pairs of successive terms of v; a(n) = denominator of b(n).