a(n) is the prime or perfect or amicable or sociable number encountered in the aliquot sequence for 2^n.

A358415

a(n) is the prime or perfect or amicable or sociable number encountered in the aliquot sequence for 2^n.

Terms

    a(0) =2a(1) =3a(2) =7a(3) =3a(4) =31a(5) =41a(6) =127a(7) =41a(8) =43a(9) =7a(10) =113a(11) =7a(12) =8191a(13) =6a(14) =6a(15) =313a(16) =131071a(17) =211457a(18) =524287a(19) =53a(20) =4217a(21) =433a(22) =41a(23) =547a(24) =2243a(25) =691921a(26) =21275809a(27) =673a(28) =76831a(29) =467

External references