Compound filter (prime signature of n & sum of squarefree divisors of n): a(n) = P(A046523(n), A048250(n)), where P(n,k) is sequence A000027 used as a pairing function.
A291758
Compound filter (prime signature of n & sum of squarefree divisors of n): a(n) = P(A046523(n), A048250(n)), where P(n,k) is sequence A000027 used as a pairing function.
Terms
- a(0) =1a(1) =8a(2) =12a(3) =19a(4) =23a(5) =142a(6) =38a(7) =53a(8) =25a(9) =259a(10) =80a(11) =265a(12) =107a(13) =412a(14) =412a(15) =169a(16) =173a(17) =265a(18) =212a(19) =418a(20) =672a(21) =826a(22) =302a(23) =619a(24) =40a(25) =1087a(26) =63a(27) =607a(28) =467a(29) =5080
External references
- oeis: A291758