A317335 a(n) = A317332(n) - 8*n.

1, 1, -2, 1, 1, -2, -2, 1, 1, 1, -2, -2, 1, -2, -2, 1, 1, 1, -2, 1, 1, -2, -2, -2, 1, 1, -2, -2, 1, -2, -2, 1, 1, 1, -2, 1, 1, -2, -2, 1, 1, 1, -2, -2, 1, -2, -2, -2, 1, 1, -2, 1, 1, -2, -2, -2, 1, 1, -2, -2, 1, -2, -2

Offset

1,3

Links

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

Formula

a(4*n-3) = 1, a(4*n-1) = -2, a(2*n) = a(n) for n > 0.

abs(a(n)+1) = A014710(n-1).

abs(a(n)) = A014709(n-1).

Prog

(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-1-8*n)

Crossrefs

Cf. A317331, A317332, A317333, A317336.

Sequence in context: A037826 A079882 A362415 * A014709 A278161 A069258

Adjacent sequences: A317332 A317333 A317334 * A317336 A317337 A317338

Keyword

sign

Author

A.H.M. Smeets, Jul 26 2018

Status

approved