A381218 Odd numbers with both an odd number of prime factors (counted with multiplicity) and an odd number of distinct prime factors. (Intersection of A067019 and A098903.)

3, 5, 7, 11, 13, 17, 19, 23, 27, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 105, 107, 109, 113, 125, 127, 131, 137, 139, 149, 151, 157, 163, 165, 167, 173, 179, 181, 191, 193, 195, 197, 199, 211, 223, 227, 229, 231, 233, 239

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[1, 301, 2], AllTrue[{PrimeOmega[#], PrimeNu[#]}, OddQ]&]

Crossrefs

Cf. A067019, A098903

Sequence in context: A309203 A176847 A067019 * A132106 A242393 A210494

Adjacent sequences: A381215 A381216 A381217 * A381219 A381220 A381221

Keyword

nonn,easy

Author

Harvey P. Dale, Feb 17 2025

Status

approved