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A325566 a(n) is the largest divisor d of n such that A048720(A065621(d),n/d) = n. 7
1, 2, 1, 4, 1, 2, 1, 8, 3, 2, 1, 4, 1, 2, 1, 16, 1, 6, 1, 4, 3, 2, 1, 8, 1, 2, 1, 4, 1, 2, 1, 32, 11, 2, 5, 12, 1, 2, 1, 8, 1, 6, 1, 4, 3, 2, 1, 16, 7, 2, 1, 4, 1, 2, 1, 8, 1, 2, 1, 4, 1, 2, 1, 64, 13, 22, 1, 4, 1, 10, 1, 24, 1, 2, 5, 4, 1, 2, 1, 16, 1, 2, 1, 12, 1, 2, 1, 8, 1, 6, 1, 4, 3, 2, 1, 32, 1, 14, 1, 4, 1, 2, 1, 8, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..16383

Antti Karttunen, Data supplement: n, a(n) computed for n = 1..65537

PROG

(PARI)

A048720(b, c) = fromdigits(Vec(Pol(binary(b))*Pol(binary(c)))%2, 2);

A065621(n) = bitxor(n-1, n+n-1);

A325566(n) = fordiv(n, d, if(A048720(A065621(n/d), d)==n, return(n/d)));

CROSSREFS

Cf. A048720, A065621, A325565, A325567, A325570 (positions of ones).

Sequence in context: A333763 A076775 A324873 * A218621 A079891 A108738

Adjacent sequences:  A325563 A325564 A325565 * A325567 A325568 A325569

KEYWORD

nonn

AUTHOR

Antti Karttunen, May 09 2019

STATUS

approved

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Last modified July 25 11:31 EDT 2021. Contains 346289 sequences. (Running on oeis4.)