Triple-safe primes p: p, (p-1)/2, (p-3)/4, and (p-7)/8 are all prime.

Terms

a(0) =23a(1) =47a(2) =719a(3) =1439a(4) =2879a(5) =4079a(6) =9839a(7) =11279a(8) =21599a(9) =28319a(10) =51599a(11) =84719a(12) =92399a(13) =95279a(14) =96959a(15) =137279a(16) =157679a(17) =159119a(18) =178799a(19) =209519a(20) =219839a(21) =243119a(22) =349199a(23) =429119a(24) =430799a(25) =441839a(26) =462719a(27) =481199a(28) =491279a(29) =507359