Smallest of four consecutive primes whose average is a triangular number.

Terms

a(0) =11a(1) =47a(2) =101a(3) =109a(4) =241a(5) =587a(6) =1217a(7) =1481a(8) =2069a(9) =2203a(10) =3313a(11) =4357a(12) =5443a(13) =6779a(14) =7351a(15) =7489a(16) =10723a(17) =11927a(18) =12239a(19) =16267a(20) =18911a(21) =24517a(22) =24733a(23) =27953a(24) =36571a(25) =44839a(26) =51347a(27) =55249a(28) =55931a(29) =56941