A351139 - cp's OEIS frontend

A351139 a(n) is the least k such that the continued fraction for sqrt(k) has periodic part [r, 1, 2, ..., n-1, n, n-1, ..., 1, 2r] for some positive integer r.

n	a(n)
1	3
2	14
3	216
4	25185
5	23287359
6	1953082923
7	81112983931776
8	6667182474680388
9	699567746120736710880
10	855784807474766398870755
11	51592564054278677032777194015
12	1474855822717073602911008555048040
13	23175672095781915301598668218548941215
14	474577479777785868138090462593743556930231

[3, 14, 216, 25185, 23287359, 1953082923, 81112983931776, 6667182474680388, 699567746120736710880, 855784807474766398870755, 51592564054278677032777194015, 1474855822717073602911008555048040, 23175672095781915301598668218548941215, 474577479777785868138090462593743556930231]

cp's OEIS Frontend

A351139 a(n) is the least k such that the continued fraction for sqrt(k) has periodic part [r, 1, 2, ..., n-1, n, n-1, ..., 1, 2r] for some positive integer r.

Table of values

List of values