A391579 Fixed points of A391573.

1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 17, 18, 19, 20, 21, 24, 25, 30, 32, 33, 34, 35, 36, 37, 38, 40, 41, 42, 45, 48, 49, 50, 51, 60, 64, 65, 66, 67, 68, 69, 70, 72, 73, 74, 76, 80, 81, 82, 84, 85, 90, 96, 97, 98, 100, 102, 120, 128, 129, 130, 131, 132, 133, 134, 136, 137, 138, 140, 144, 145, 146, 147, 148, 149

Offset

1,2

Comments

If n is present, then 2*n is also present, and vice versa.

Links

Antti Karttunen, Table of n, a(n) for n = 1..10000

Index entries for sequences defined by congruent products between domains N and GF(2)[X].

Index entries for sequences related to binary expansion of n.

Index entries for sequences related to carryless arithmetic.

Prog

(PARI)
A048720(b, c) = fromdigits(Vec(Pol(binary(b))*Pol(binary(c)))%2, 2);
A391573(n) = { my(t); forstep(k=3, oo, 2, if(!((t=A048720(n, k))%k), return(t/k))); };
is_A391579(k) = (A391573(k)==k);

Crossrefs

Cf. A003714 (subsequence), A048720, A391573, A391578 (complement).

Sequence in context: A082415 A005236 A051250 * A143071 A305759 A143513

Adjacent sequences: A391576 A391577 A391578 * A391580 A391581 A391582

Keyword

nonn,base

Author

Antti Karttunen, Dec 17 2025

Status

approved