Lesser of consecutive primes whose average is an oblong number.

Terms

a(0) =5a(1) =11a(2) =29a(3) =41a(4) =53a(5) =71a(6) =239a(7) =337a(8) =419a(9) =461a(10) =503a(11) =547a(12) =599a(13) =647a(14) =863a(15) =1051a(16) =1187a(17) =1481a(18) =1721a(19) =1801a(20) =2549a(21) =2647a(22) =2969a(23) =3539a(24) =4421a(25) =6317a(26) =7129a(27) =8009a(28) =10301a(29) =12653