The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A343566 Numbers k such that A343564(k) is divisible by 2*k. 1
 1, 2, 3, 24, 63, 107, 263, 383, 504, 75414, 17389821, 47574810 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE a(4) = 24 is a term because A343564(24) = 96 is divisible by 2*24 = 48. MAPLE N:= 100000: # for terms <= N P:= select(isprime, [seq(i, i=3..2*N)]): f:= proc(n) local m, Q, q;   m:= ListTools:-BinaryPlace(P, 2*n);   Q:= convert(P[1..m], set);   Q:= Q intersect map(t -> 2*n-t, Q);   add(2*n mod q, q = Q); end proc: A343564:= map(f, [\$1..N]): select(t -> A[t] mod (2*t) = 0, [\$1..N]); CROSSREFS Cf. A343564. Sequence in context: A061355 A160618 A279335 * A057665 A157327 A174073 Adjacent sequences:  A343563 A343564 A343565 * A343567 A343568 A343569 KEYWORD nonn,more AUTHOR J. M. Bergot and Robert Israel, Apr 20 2021 EXTENSIONS a(11) and a(12) from Martin Ehrenstein, Apr 25 2021 STATUS approved

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

Last modified May 20 23:05 EDT 2022. Contains 353886 sequences. (Running on oeis4.)