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

1,2

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)

Prog

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

Crossrefs

Cf. A156552, A329638, A329639, A329641.

Cf. A324201 (a subsequence).

Cf. also A326141.

Sequence in context: A067552 A224977 A195085 * A052489 A034033 A115552

Adjacent sequences: A329637 A329638 A329639 * A329641 A329642 A329643

Keyword

nonn

Author

Antti Karttunen, Nov 21 2019

Status

approved