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A008558
Repeatedly convert from decimal to octal.
1
9, 11, 13, 15, 17, 21, 25, 31, 37, 45, 55, 67, 103, 147, 223, 337, 521, 1011, 1763, 3343, 6417, 14421, 34125, 102515, 310163, 1135623, 4252007, 20160547, 114720043, 665476453, 4752456545, 43321135541, 502611010665, 7240574662151, 151272370273007
OFFSET
1,1
MATHEMATICA
NestList[FromDigits[IntegerDigits[#, 8]]&, 9, 40] (* Harvey P. Dale, Apr 09 2012 *)
PROG
(Python)
def aupton(terms):
alst = [9]
for n in range(2, terms+1): alst.append(int(oct(alst[-1])[2:]))
return alst
print(aupton(35)) # Michael S. Branicky, Sep 11 2021
CROSSREFS
Cf. A007094.
Sequence in context: A065454 A334688 A248629 * A335912 A123760 A289686
KEYWORD
nonn,base
AUTHOR
sbv(AT)VNET.IBM.COM (Scott Vetter), msvetter(AT)eng.xyplex.com (Mark Vetter)
STATUS
approved