A353710 - OEIS

%I #14 May 10 2022 09:54:55

%S 0,1,2,3,3,3,5,5,5,5,5,5,5,5,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,

%T 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,11,11,11,15,15,15,15,15,15,

%U 15,15,15,15,15,15,15,15,15,15,15,15,15,15,23,23,23,23,23,23,23,23,23,23,27,27,27,27,29,29,29,29,29,29,29,29,29,29,29,29

%N Smallest missing number when A353709(n) is being calculated.

%H Rémy Sigrist, <a href="/A353710/b353710.txt">Table of n, a(n) for n = 0..16384</a>

%H Rémy Sigrist, <a href="/A353710/a353710.gp.txt">PARI program</a>

%o (PARI) See Links section.

%o (Python)

%o from itertools import count, islice

%o def A353710_gen(): # generator of terms

%o     s, a, b, c, ab = {0,1}, 0, 1, 2, 1

%o     yield from (0,1)

%o     while True:

%o         for n in count(c):

%o             if not (n & ab or n in s):

%o                 yield c

%o                 a, b = b, n

%o                 ab = a|b

%o                 s.add(n)

%o                 while c in s:

%o                     c += 1

%o                 break

%o A353710_list = list(islice(A353710_gen(),20)) # _Chai Wah Wu_, May 10 2022

%Y Cf. A084937, A353709.

%K nonn,base

%O 0,3

%A _N. J. A. Sloane_, May 06 2022