Primes ending in 777.

Terms

a(0) =1777a(1) =2777a(2) =11777a(3) =19777a(4) =22777a(5) =26777a(6) =41777a(7) =43777a(8) =44777a(9) =47777a(10) =50777a(11) =53777a(12) =65777a(13) =67777a(14) =68777a(15) =71777a(16) =76777a(17) =79777a(18) =80777a(19) =83777a(20) =94777a(21) =97777a(22) =107777a(23) =110777a(24) =113777a(25) =115777a(26) =122777a(27) =124777a(28) =125777a(29) =131777