A374221 Indices of 1's in A374200, where A374200 is the minimum value of A347381 that it obtains among unitary divisors of n larger than 1.

3, 4, 5, 12, 15, 20, 21, 24, 33, 35, 36, 39, 40, 44, 45, 48, 51, 52, 55, 57, 60, 65, 68, 69, 75, 76, 80, 85, 87, 92, 93, 95, 96, 100, 105, 108, 111, 115, 116, 120, 123, 124, 129, 132, 135, 141, 145, 147, 148, 155, 156, 159, 160, 164, 165, 168, 172, 177, 180, 183, 185, 188, 189, 192, 195, 196, 201, 204, 205, 212, 213

Offset

1,1

Comments

It seems that for all odd terms x in this sequence, A374204(x) = 1, and they form a subsequence of all terms k for which A374204(k) = 1, that might be sequence A086748.

Links

Antti Karttunen, Table of n, a(n) for n = 1..20001

Prog

(PARI) isA374221 = A374220;

Crossrefs

Cf. A000203, A005940, A347381, A374200, A374204, A374220 (characteristic function).

Cf. also A086748 and A347391 (very likely a subsequence).

Sequence in context: A372590 A242669 A090829 * A236244 A141290 A010752

Adjacent sequences: A374218 A374219 A374220 * A374222 A374223 A374224

Keyword

nonn

Author

Antti Karttunen, Jul 09 2024

Status

approved