Williams primes of the form 2•3n-1

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Reserved! This sequence is currently reserved by: Borys Jaworski

Current data

Base : 3
Count : 37
Max n : 1,840,000
Date : 2019-03-01
Reserved : Borys JaworskiBorys Jaworski/Reserved
1, 2, 3, 7, 8, 12, 20, 23, 27, 35, 56, 62, 68, 131, 222, 384, 387, 579, 644, 1772, 3751, 5270, 6335, 8544, 9204, 12312, 18806, 21114, 49340, 75551, 90012, 128295, 143552, 147488, 1010743, 1063844, 1360104
Remarks :
See H.C.Williams, C.R.Zarnke: "Some prime numbers of the forms 2A3^n+1 and 2A3^n-1" Math. Comp. 26 (1972), 995-998
The sequence A003307 in OEIS

History