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Williams primes of the form 2•3n+1

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Current data

Base : 3
Count : 40
Max n : 1,175,200
Date : 2010
1, 2, 4, 5, 6, 9, 16, 17, 30, 54, 57, 60, 65, 132, 180, 320, 696, 782, 822, 897, 1252, 1454, 4217[1], 5480, 6225[2], 7842, 12096, 13782, 17720, 43956, 64822, 82780, 105106, 152529[3], 165896, 191814, 529680, 1074726, 1086112, 1175232
Remarks :
The sequence A003306 in OEIS

Notes

  1. ↑ Divides Phi(3^4217,2)
  2. ↑ Divides Phi(3^6223,2)
  3. ↑ Divides Phi(3^152528,2)

History

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