Second pentagonal numbers that are interprime.

Terms

a(0) =15a(1) =26a(2) =260a(3) =495a(4) =610a(5) =950a(6) =1190a(7) =1962a(8) =2420a(9) =2667a(10) =3197a(11) =3337a(12) =3480a(13) =6370a(14) =7597a(15) =14455a(16) =15965a(17) =18205a(18) =39447a(19) =42926a(20) =43947a(21) =50325a(22) =57135a(23) =63140a(24) =64377a(25) =65000a(26) =66255a(27) =74037a(28) =78090a(29) =82251