A317335 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

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