A376874 a(n) = A376877(n) / p where p is the largest prime factor of A376877(n).

6, 20, 28, 88, 104, 272, 304, 550, 650, 368, 464, 496, 1184, 1312, 1376, 1504, 1696, 1888, 1952, 11132, 4288, 4544, 4672, 5056, 5312, 5696, 6208, 6464, 6592, 6848, 6976, 7232, 8128, 16768, 17536, 17792, 19072, 19328, 20096, 20864, 21376, 22144, 22912, 23168, 24448

Offset: 1

Author

Peter Luschny and Michael S. Branicky, Oct 27 2024

Keywords

• nonn

Comments

Apparently a subset of A006039 and of A180332.

It seems that the terms are abundant numbers unless p is a Mersenne prime; in that case they are perfect numbers (unproved).

Terms a(1)-a(59) are each divisible by the corresponding p, and many of those quotients are powers of 2.

Links

• Peter Luschny and Michael S. Branicky, Table of n, a(n) for n = 1..59

Crossrefs

Cf. A376877, A006039, A180332, A023196, A083207.

Programs

Maple

a := proc(n) A376877(n); % / max(NumberTheory:-PrimeFactors(%)) end:
seq(a(n), n = 1..45);