Array read by rows: row n lists n-th even superperfect number A061652(n), n-th Mersenne prime A000668(n) and n-th perfect number A000396(n).

A138728

Array read by rows: row n lists n-th even superperfect number A061652(n), n-th Mersenne prime A000668(n) and n-th perfect number A000396(n).

Terms

    a(0) =2a(1) =3a(2) =6a(3) =4a(4) =7a(5) =28a(6) =16a(7) =31a(8) =496a(9) =64a(10) =127a(11) =8128a(12) =4096a(13) =8191a(14) =33550336a(15) =65536a(16) =131071a(17) =8589869056a(18) =262144a(19) =524287a(20) =137438691328a(21) =1073741824a(22) =2147483647

External references