Initial (unsafe) primes of Cunningham chains of first type with length exactly 5. Primes in A059453 that survive as primes just four "2p+1 iterations", forming chains of exactly 5 terms.
A059764
Initial (unsafe) primes of Cunningham chains of first type with length exactly 5. Primes in A059453 that survive as primes just four "2p+1 iterations", forming chains of exactly 5 terms.
Terms
- a(0) =2a(1) =53639a(2) =53849a(3) =61409a(4) =66749a(5) =143609a(6) =167729a(7) =186149a(8) =206369a(9) =268049a(10) =296099a(11) =340919a(12) =422069a(13) =446609a(14) =539009a(15) =594449a(16) =607319a(17) =658349a(18) =671249a(19) =725009a(20) =775949a(21) =812849a(22) =819509a(23) =926669a(24) =1008209a(25) =1092089a(26) =1132949a(27) =1271849
External references
- oeis: A059764