Least number k such that d(k-1) = d(k+1) = 2n or 0 if no such k exists, where d(n)=A000005(n).

A190646

Least number k such that d(k-1) = d(k+1) = 2n or 0 if no such k exists, where d(n)=A000005(n).

Terms

    a(0) =4a(1) =7a(2) =19a(3) =41a(4) =127252a(5) =199a(6) =26890624a(7) =919a(8) =17299a(9) =6641a(11) =3401a(13) =640063a(14) =8418574a(15) =18089a(17) =41651a(19) =128465a(20) =34084859374a(21) =12164095a(23) =90271

External references