A380543 Nonsquarefree weak numbers k whose squarefree kernel is a primorial.
12, 18, 24, 48, 54, 60, 90, 96, 120, 150, 162, 180, 192, 240, 270, 300, 360, 384, 420, 450, 480, 486, 540, 600, 630, 720, 750, 768, 810, 840, 960, 1050, 1080, 1200, 1260, 1350, 1440, 1458, 1470, 1500, 1536, 1620, 1680, 1890, 1920, 2100, 2160, 2250, 2400, 2430
Offset: 1
Examples
Table of n, a(n) and prime decomposition for n = 1..12: n a(n) prime decomposition ------------------------------ 1 12 2^2 * 3 2 18 2 * 3^2 3 24 2^3 * 3 4 48 2^4 * 3 5 54 2 * 3^3 6 60 2^2 * 3 * 5 7 90 2 * 3^2 * 5 8 96 2^5 * 3 9 120 2^3 * 3 * 5 10 150 2 * 3 * 5^2 11 162 2 * 3^4 12 180 2^2 * 3^2 * 5
Links
- Michael De Vlieger, Table of n, a(n) for n = 1..10000
Comments