A325569 Numbers n for which A325565(n) < A325568(n).

135, 279, 525, 567, 651, 1143, 1323, 2079, 2205, 2295, 2667, 2835, 3087, 4123, 4165, 4185, 4191, 4445, 4599, 5355, 5715, 6223, 8211, 8255, 8370, 8415, 8505, 8925, 9207, 9359, 9765, 10731, 11475, 11811, 12397, 12495, 13335, 16575, 16863, 17010, 17325, 17577, 17885, 18423, 18767, 19467, 21483, 22995, 23715, 24583, 24941, 25039

Offset: 1

Author

Antti Karttunen, May 09 2019

Keywords

• nonn

Examples

			135 has eight divisors: 1, 3, 5, 9, 15, 27, 45, 135. Of these only two, d = 1 and d = 9 are such that A048720(A065621(d),135/d) = 135, thus A325565(135) = 2. On the other hand, when iterating A325567 starting from 135 we get: A325567(135) = 9, A325567(9) = 3 and A325567(3) = 1, so A325568(135) = 3 > A325565(135), thus 135 is included in this sequence.
		

Links

• Antti Karttunen, Table of n, a(n) for n = 1..1001

Crossrefs

Cf. A325565, A325567, A325568.

Programs

PARI

isA325569(n) = (A325565(n)<A325568(n));