OFFSET
1,1
REFERENCES
Heard over coffee at the Computers in Scientific Discovery meeting in Ghent, Feb 02 2006.
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..10000
EXAMPLE
1,3,7,15,31,63,...
MATHEMATICA
FromDigits[#] & /@ Partition[ Flatten[ IntegerDigits[ Table[ 2^n - 1, {n, 31}]]], 3] (* Robert G. Wilson v, Jun 23 2014 *)
PROG
(Python)
from itertools import count, islice
def bgen(): yield from (d for n in count(1) for d in str((1 << n)-1))
def agen(): g = bgen(); yield from (int("".join(t)) for t in zip(g, g, g))
print(list(islice(agen(), 54))) # Michael S. Branicky, Dec 25 2022
CROSSREFS
KEYWORD
nonn,base,dumb
AUTHOR
N. J. A. Sloane, Feb 18 2006
EXTENSIONS
More terms from Matthew Conroy, Mar 12 2006
STATUS
approved