Multiperfect numbers k for which gcd(k,A003961(k))*gcd(sigma(k),A276086(k)) is equal to gcd(k,A276086(k))*gcd(sigma(k),A003961(k)), where A003961(n) is fully multiplicative with a(prime(i)) = prime(i+1), and A276086 is the primorial base exp-function.
A379491
Multiperfect numbers k for which gcd(k,A003961(k))*gcd(sigma(k),A276086(k)) is equal to gcd(k,A276086(k))*gcd(sigma(k),A003961(k)), where A003961(n) is fully multiplicative with a(prime(i)) = prime(i+1), and A276086 is the primorial base exp-function.
Terms
- a(0) =1a(1) =6a(2) =28a(3) =496a(4) =8128a(5) =30240a(6) =32760a(7) =2178540a(8) =23569920a(9) =33550336a(10) =45532800a(11) =142990848a(12) =459818240a(13) =1379454720a(14) =8589869056a(15) =43861478400a(16) =51001180160a(17) =66433720320a(18) =137438691328a(19) =153003540480a(20) =403031236608a(21) =704575228896
External references
- oeis: A379491