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A302036 Ludic powers: numbers k such that A302031(k) < 2; numbers k such that A260739(k) is a power of 2. 9

%I #17 Jul 21 2021 00:45:06

%S 1,2,3,4,5,7,8,9,11,13,16,17,19,21,23,25,29,31,32,37,41,43,45,47,49,

%T 53,55,61,64,67,71,73,77,83,85,89,91,93,97,101,107,109,115,119,121,

%U 127,128,131,143,145,149,151,157,161,167,173,175,179,181,189,191,193,197,205,209,211,221,223,227,229,233,235,239,247,253,256,257

%N Ludic powers: numbers k such that A302031(k) < 2; numbers k such that A260739(k) is a power of 2.

%C An analog of A000961 for factorization process based on the Ludic sieve (A255127).

%C Numbers k for which A302031(k) < 2, or equally, for which A302034(k) = 1, or equally, for which A209229(A260739(k)) = 1.

%H Antti Karttunen, <a href="/A302036/b302036.txt">Table of n, a(n) for n = 1..3600</a>

%H <a href="/index/Si#sieve">Index entries for sequences generated by sieves</a>

%o (PARI) for(n=1,257,if(A302031(n)<2,print1(n,","))); \\ See also code in A302031.

%Y Cf. A260739, A302031, A302034.

%Y Cf. A000079, A003309, A254100 (subsequences).

%Y Cf. also A000961, A302038, A302040.

%K nonn

%O 1,2

%A _Antti Karttunen_, Apr 02 2018

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Last modified April 25 13:44 EDT 2024. Contains 371975 sequences. (Running on oeis4.)