A391859 Odd numbers k such that 25*k = A048720(m, k) for some m, where A048720 is carryless base-2 multiplication.

1, 3, 5, 7, 31, 33, 51, 63, 65, 93, 95, 125, 127, 129, 133, 161, 191, 253, 255, 257, 261, 321, 381, 383, 387, 509, 511, 513, 517, 641, 645, 765, 767, 771, 775, 819, 899, 1021, 1023, 1025, 1029, 1057, 1281, 1285, 1533, 1535, 1539, 1543, 1795, 1799, 2045, 2047, 2049, 2053, 2081, 2113, 2561, 2565, 3069, 3071, 3075

Offset

1,2

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.

Formula

{Odd k such that A280500(25*k, k) = m for some m > 0}.

Example

See examples in A391858.

Prog

(PARI) is_A391859(k) = ((k%2) && (0==lift(Pol(binary(25*k)*Mod(1, 2)) % Pol(binary(k))*Mod(1, 2))));

Crossrefs

Row 25 of A391725. Odd terms of A391858.

Cf. A048720, A280500.

Cf. also A391745, A391861.

Sequence in context: A124077 A288891 A358699 * A391855 A322749 A270269

Adjacent sequences: A391856 A391857 A391858 * A391860 A391861 A391862

Keyword

nonn,base

Author

Antti Karttunen, Dec 21 2025

Status

approved