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A325570 Numbers n that have no divisor d > 1 such that A048720(A065621(d),n/d) = n. 6
1, 3, 5, 7, 11, 13, 15, 17, 19, 23, 25, 27, 29, 31, 37, 39, 41, 43, 47, 51, 53, 55, 57, 59, 61, 63, 67, 69, 71, 73, 77, 79, 81, 83, 85, 87, 89, 91, 95, 97, 99, 101, 103, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 131, 137, 139, 141, 143, 145, 147, 149, 151, 157, 159, 163, 167, 169, 171, 173, 175, 177, 179, 181 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

PROG

(PARI)

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

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

isA325570(n) = fordiv(n, d, if(A048720(A065621(n/d), d)==n, return(d==n)));

CROSSREFS

Cf. A048720, A065621, A115872, A115873.

Positions of ones in A325565 and A325566.

Cf. A065091 (a subsequence), A325571 (the composite terms), A325572 (complement).

Subsequence of A005408 (odd numbers).

Sequence in context: A152955 A235866 A334141 * A210719 A322840 A336374

Adjacent sequences:  A325567 A325568 A325569 * A325571 A325572 A325573

KEYWORD

nonn

AUTHOR

Antti Karttunen, May 10 2019

STATUS

approved

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Last modified July 29 12:41 EDT 2021. Contains 346346 sequences. (Running on oeis4.)