A008557 Repeatedly convert from decimal to octal.

8, 10, 12, 14, 16, 20, 24, 30, 36, 44, 54, 66, 102, 146, 222, 336, 520, 1010, 1762, 3342, 6416, 14420, 34124, 102514, 310162, 1135622, 4252006, 20160546, 114720042, 665476452, 4752456544, 43321135540, 502611010664, 7240574662150, 151272370273006

Offset

1,1

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..75

Formula

a(n+1) = A007094(a(n)), a(1) = 8. - Reinhard Zumkeller, Aug 29 2013

Mathematica

NestList[ FromDigits[ IntegerDigits[ #, 8 ]] &, 8, 35 ]

Prog

(Haskell)
a008557 n = a008557_list !! (n-1)
a008557_list = iterate a007094 8  -- Reinhard Zumkeller, Aug 29 2013
(Python)
def aupton(terms):
    alst = [8]
    for n in range(2, terms+1): alst.append(int(oct(alst[-1])[2:]))
    return alst
print(aupton(35)) # Michael S. Branicky, Aug 10 2021

Crossrefs

Cf. A007094, A008558.

Sequence in context: A262159 A020744 A356657 * A378174 A161425 A096171

Adjacent sequences: A008554 A008555 A008556 * A008558 A008559 A008560

Keyword

nonn,base,nice,easy

Author

sbv(AT)VNET.IBM.COM (Scott Vetter), msvetter(AT)eng.xyplex.com (Mark Vetter)

Status

approved