Taxi-cab numbers n such that n-1 and n+1 are both prime.

Terms

a(0) =32832a(1) =513000a(2) =2101248a(3) =8647128a(4) =43570872a(5) =46661832a(6) =152275032a(7) =166383000a(8) =175959000a(9) =351981000a(10) =543449088a(11) =610991208a(12) =809557632a(13) =970168752a(14) =1710972648a(15) =2250265752a(16) =2262814272a(17) =2560837032a(18) =3222013032a(19) =3308144112a(20) =3582836712a(21) =4505949000a(22) =4543936488a(23) =4674301632a(24) =4868489178