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

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

Offset: 1

Author

Antti Karttunen, Apr 02 2018

Keywords

• nonn

Comments

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

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

Links

• Antti Karttunen, Table of n, a(n) for n = 1..3600
• Index entries for sequences generated by sieves

Crossrefs

Cf. A260739, A302031, A302034.

Cf. A000079, A003309, A254100 (subsequences).

Cf. also A000961, A302038, A302040.

Programs

PARI

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