Williams primes of the form 10•9n-1

Reserved! This sequence is currently reserved by: Riley Fisher

Current data

Base : 9 Count : 34 Max n : 250,000 Date : 2024-08-22 Reserved : Riley FisherRiley Fisher/Reserved

1, 2, 4, 5, 7, 10, 11, 13, 15, 19, 27, 29, 35, 42, 51, 70, 112, 164, 179, 180, 242, 454, 621, 2312, 3553, 6565, 14026, 16083, 18493, 43289, 44970, 73654, 79638, 218669

Remarks :

This list should be a (re)use of 10•3n-1! Halved even values of the sequence A005542 in OEIS

History

• 2024-08-22: Checked n = 100000 - 250000, Riley Fisher
• 2024-08-19: Found n = 218669, Riley Fisher
• 2024-04-20: Reserved by Riley Fisher
• 2014-03-16: Checked n = 1 - 100000, Robert Price