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A305370
Index of 2^n in A109812.
11
1, 2, 3, 5, 8, 15, 29, 50, 103, 164, 417, 649, 1324, 2684, 5348, 10226, 21298, 41538, 84652, 165034, 322262, 646648, 1283556, 2584860, 5163368, 10271638, 20566708, 40308350, 80758553, 161522919, 322519008, 637135132
OFFSET
0,2
COMMENTS
It would be nice to have a formula for a(n).
The data suggests that a(n) is growing very roughly like 2^n/3.261. - N. J. A. Sloane, Mar 29 2022
EXAMPLE
A109812(15) = 32 = 2^5, so a(5) = 15.
PROG
(C++) See Links section.
CROSSREFS
Sequence in context: A049861 A130476 A096592 * A192571 A215525 A192645
KEYWORD
nonn,more,base
AUTHOR
N. J. A. Sloane, Jun 02 2018
EXTENSIONS
a(14)-a(22) from Chai Wah Wu, Jun 04 2018
a(23)-a(24) from Giovanni Resta, Jun 06 2018
a(25)-a(26) from Rémy Sigrist, Dec 05 2021
a(27)-a(28) from Walter Trump, Apr 13 2022
a(29)-a(31) from Walter Trump, Apr 26 2022
STATUS
approved