A317333 Indices m for which A058304(m) = 9.

1, 6, 14, 25, 30, 38, 49, 57, 62, 70, 78, 89, 97, 102, 113, 121, 126, 134, 142, 153, 158, 166, 177, 185, 193, 198, 206, 217, 225, 230, 241, 249, 254, 262, 270, 281, 286, 294, 305, 313, 318, 326, 334, 345, 353, 358, 369, 377, 385, 390, 398, 409, 414, 422, 433, 441, 449, 454, 462, 473, 481, 486, 497, 505

Offset: 1

Author

A.H.M. Smeets, Jul 26 2018

Keywords

• nonn

Links

• A.H.M. Smeets, Table of n, a(n) for n = 1..20000

Crossrefs

Cf. A058304, A317331, A317332, A317335, A317336.

Programs

Python

n, f, i, p, q = 1, 1, 0, 0, 1
while i < 1000000:
    i, p, q = i+1, p*10, q*10
    if i == f:
        p, n = p+1, n+1
        f = f*n
n, a, j = 0, 0, 0
while p%q > 0:
    a, f, p, q = a+1, p//q, q, p%q
    if f == 9:
        n = n+1
        print(n, a-1)

Formula

a(n) = 8*n + A317336(n).