Least number k such that k and k+2 both have exactly 2n divisors, or -1 if no such number exists.

A356766

Least number k such that k and k+2 both have exactly 2n divisors, or -1 if no such number exists.

Terms

    a(0) =3a(1) =6a(2) =18a(3) =40a(4) =127251a(5) =198a(6) =26890623a(7) =918a(8) =17298a(9) =6640a(11) =3400a(13) =640062a(14) =8418573a(15) =18088a(17) =41650a(19) =128464a(20) =34084859373a(21) =12164094a(23) =90270a(24) =418514293125a(25) =64505245696

External references