A106379 Real part of Gaussian prime numbers such that the Gaussian primorial product up to them is a Gaussian prime plus one.
1, 2, 3, 6, 5, 11, 10, 18, 12, 19, 10, 13, 5, 20, 6, 50, 74, 112, 40, 140, 139
Offset: 1
Examples
(1+i)*(1+2i)*(2+i)*3*(2+3i)*(3+2i) - 1 = (-195-195i) - 1 = (-196-195i), which is a Gaussian prime. This is the third number with the property, so a(3) = 3.
Links
- Sven Simon, Readable list for A106379/A106380.
Extensions
Offset corrected and a(16)-a(21) added by Amiram Eldar, Aug 16 2025
Comments