A106128 Numbers k such that the k-th semiprime == 3 (mod k).
1, 3, 6, 36, 46, 78, 6915, 6916, 613375, 613378, 613404, 613406, 613414, 613438, 613448, 613454, 613456, 613508, 613519, 613522, 613532, 613559, 613568, 613570, 613582, 613586, 613598, 58155528, 58155536, 58155549, 6384425454, 6384425520, 6384425522, 6384425528, 6384425638
Offset: 1
Examples
a(3) = 6 is a term because the 6th semiprime is 15 and 15 == 3 (mod 6).
Links
- Lucas A. Brown, Table of n, a(n) for n = 1..47
- Lucas A. Brown, semiprimemods.py
Extensions
a(28)-a(30) from Donovan Johnson, Oct 29 2008
a(1), a(2), and a(31)-a(47) by Lucas A. Brown, Oct 19 2020
Comments