A342649 Numbers k such that A238525(k) divides k.

6, 8, 9, 18, 20, 21, 24, 25, 32, 36, 42, 45, 48, 49, 50, 52, 56, 64, 66, 78, 80, 81, 98, 100, 108, 110, 112, 117, 120, 121, 125, 126, 128, 130, 132, 135, 144, 152, 154, 160, 168, 169, 170, 175, 186, 192, 200, 204, 210, 216, 225, 234, 242, 243, 252, 255, 264, 266, 276, 280, 285, 289, 290, 301, 306

Offset

1,1

Comments

Includes squares of odd primes.

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Example

a(4) = 18 is a term because A238525(18) = 2 divides 18.

Maple

filter:= proc(n) local t, s, r;
   if isprime(n) then return false fi;
   s:= add(t[1]*t[2], t=ifactors(n)[2]);
   r:= n mod s;
   r <> 0 and n mod r = 0;
end proc:
select(filter, [$4..1000]);

Crossrefs

Cf. A238525.

Disjoint from A036844.

Sequence in context: A092115 A083966 A074326 * A254321 A174213 A284990

Adjacent sequences: A342646 A342647 A342648 * A342650 A342651 A342652

Keyword

nonn

Author

J. M. Bergot and Robert Israel, Mar 17 2021

Status

approved