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Williams primes of the form 4•3n+1

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Current data

Base : 3
Count : 28
Max n : 1,500,000
Date : 2020-01-16
1, 2, 3, 6, 14, 15, 39, 201, 249, 885, 1005, 1254, 1635, 3306, 3522, 9602, 19785, 72698, 233583, 328689, 537918, 887535, 980925, 1154598, 1499606, 1936890, 2016951, 2143374
Remarks :
The sequence A005537 in OEIS
For all even n-values 4•3n+1 is a Generalized Fermat number.
!!!DO NOT RESERVE!!! This list is a reuse of Proth 4•3n+1.