Numbers n such that phi(sigma*(n)) = sigma*(phi(n)), where sigma*(n) is the sum of anti-divisors of n and phi(n) is the Euler totient function.
A243996
Numbers n such that phi(sigma*(n)) = sigma*(phi(n)), where sigma*(n) is the sum of anti-divisors of n and phi(n) is the Euler totient function.
Terms
- a(0) =7a(1) =9a(2) =20a(3) =25a(4) =80a(5) =143a(6) =825a(7) =3117a(8) =3216a(9) =22774a(10) =52026a(11) =55804a(12) =138276a(13) =187733a(14) =228384a(15) =265545a(16) =320766a(17) =549540a(18) =830814a(19) =839784a(20) =901376a(21) =1293552a(22) =1315776a(23) =2635866a(24) =6771114a(25) =11126800a(26) =12087848a(27) =24351460a(28) =49382242a(29) =52344292
External references
- oeis: A243996