Self-inverse permutation of natural numbers: a(1)=1, then a(p_n)=c_{a(n)}, a(c_n)=p_{a(n)}, where p_n = n-th prime, c_n = n-th composite.
A236854
Self-inverse permutation of natural numbers: a(1)=1, then a(p_n)=c_{a(n)}, a(c_n)=p_{a(n)}, where p_n = n-th prime, c_n = n-th composite.
Terms
- a(0) =1a(1) =4a(2) =9a(3) =2a(4) =16a(5) =7a(6) =6a(7) =23a(8) =3a(9) =53a(10) =26a(11) =17a(12) =14a(13) =13a(14) =83a(15) =5a(16) =12a(17) =241a(18) =35a(19) =101a(20) =59a(21) =43a(22) =8a(23) =41a(24) =431a(25) =11a(26) =37a(27) =1523a(28) =75a(29) =149
External references
- oeis: A236854