A329640 Numbers n for which A329639(n) is equal to gcd(A329638(n), A329639(n)).

1, 9, 18, 27, 45, 54, 70, 75, 84, 125, 135, 144, 153, 198, 279, 366, 390, 392, 423, 459, 747, 837, 855, 858, 891, 927, 1269, 1341, 1494, 1503, 1690, 1899, 2097, 2241, 2493, 2604, 2679, 2763, 2781, 2888, 2979, 2988, 3177, 3411, 3507, 3879, 4023, 4041, 4050, 4482, 4491, 4509, 4707, 5067, 5283, 5463, 5679, 5697, 5817, 5877, 5982, 6093

Offset: 1

Author

Antti Karttunen, Nov 21 2019

Keywords

• nonn

Comments

After the initial 1, numbers n such that A329638(n) is a multiple of A329639(n).

Links

• Antti Karttunen, Table of n, a(n) for n = 1..85 (based on Hans Havermann's factorization of A156552)

Crossrefs

Cf. A156552, A329638, A329639, A329641.

Cf. A324201 (a subsequence).

Cf. also A326141.

Programs

PARI

isA329640(n) = { my(u=A329639(n)); (u==gcd(A329638(n), u)); };