A386280 Numbers k > 1 such that A066328(k) / A001222(k) = x + 1/2 for some x >= 0.

4, 6, 14, 15, 25, 26, 33, 35, 38, 51, 58, 60, 65, 69, 74, 77, 81, 86, 88, 90, 93, 95, 96, 106, 119, 121, 122, 123, 141, 142, 143, 144, 145, 150, 158, 161, 177, 178, 184, 185, 189, 201, 202, 204, 209, 210, 214, 215, 216, 217, 219, 221, 226, 249, 260, 262, 265

Offset

1,1

Links

Table of n, a(n) for n=1..57.

Example

For k = 6: A066328(6) / A001222(6) = 3/2 = 1 + 1/2, thus k = 6 is a term.

Prog

(PARI) isok(k) = my(f=factor(k)); frac(sum(i=1, #f~, primepi(f[i, 1]))/bigomega(f)) == 1/2; \\ Michel Marcus, Oct 13 2025

Crossrefs

Cf. A001222, A066328, A324570, A338907.

Sequence in context: A310615 A310616 A310617 * A305842 A094298 A338045

Adjacent sequences: A386277 A386278 A386279 * A386281 A386282 A386283

Keyword

nonn

Author

Ctibor O. Zizka, Oct 12 2025

Status

approved