A317332 Indices m for which A058304(m) = 8.

9, 17, 22, 33, 41, 46, 54, 65, 73, 81, 86, 94, 105, 110, 118, 129, 137, 145, 150, 161, 169, 174, 182, 190, 201, 209, 214, 222, 233, 238, 246, 257, 265, 273, 278, 289, 297, 302, 310, 321, 329, 337, 342, 350, 361, 366, 374, 382, 393, 401, 406, 417, 425, 430, 438, 446, 457, 465, 470, 478, 489, 494, 502

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, A317333, 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 == 8:
        n = n+1
        print(n, a-1)

Formula

a(n) = 8*n + A317335(n).