A278047 - cp's OEIS frontend

A278047 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) = numerator of b(n).

n	a(n)
1	1
2	1
3	7
4	4
5	37
6	53
7	707
8	85
9	179077
10	289613
11	379721
12	641671
13	62836087
14	35819033
15	6367281023
16	55181728027
17	13442946373
18	490167893
19	596530310479
20	576997238399
21	116144361532321
22	4931206160615
23	164890340129357
24	1514840590670747
25	10181612956306486603
26	3295813969039399097

[1, 1, 7, 4, 37, 53, 707, 85, 179077, 289613, 379721, 641671, 62836087, 35819033, 6367281023, 55181728027, 13442946373, 490167893, 596530310479, 576997238399, 116144361532321, 4931206160615, 164890340129357, 1514840590670747, 10181612956306486603, 3295813969039399097]

cp's OEIS Frontend

A278047 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) = numerator of b(n).

Table of values

List of values

cp's OEIS Frontend

A278047 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) = numerator of b(n).

Table of values

List of values

A278047 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) = numerator of b(n).