login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A325572 Numbers n that have divisor d > 1 such that A048720(A065621(d),n/d) = n. 3
2, 4, 6, 8, 9, 10, 12, 14, 16, 18, 20, 21, 22, 24, 26, 28, 30, 32, 33, 34, 35, 36, 38, 40, 42, 44, 45, 46, 48, 49, 50, 52, 54, 56, 58, 60, 62, 64, 65, 66, 68, 70, 72, 74, 75, 76, 78, 80, 82, 84, 86, 88, 90, 92, 93, 94, 96, 98, 100, 102, 104, 105, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 129, 130, 132, 133 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Equally, numbers n such that there exists natural numbers t > 1 and u >= 1, for which A048720(t,u) = n and A065620(t)*u = n.

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);

isA325572(n) = fordiv(n, d, if(A048720(A065621(n/d), d)==n, return(d<n)));

CROSSREFS

Cf. A048720, A065620, A065621, A325570 (complement).

Union of A005843 (without zero) and A325573 (odd terms).

Sequence in context: A282760 A336375 A296214 * A337945 A247423 A182339

Adjacent sequences:  A325569 A325570 A325571 * A325573 A325574 A325575

KEYWORD

nonn

AUTHOR

Antti Karttunen, May 10 2019

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 28 06:57 EDT 2021. Contains 347703 sequences. (Running on oeis4.)