a(n) is the least integer k such that A350090(k) = 2*n-1 or -1 if no such k exists.
A350120
a(n) is the least integer k such that A350090(k) = 2*n-1 or -1 if no such k exists.
Terms
- a(0) =1a(1) =5a(2) =22a(3) =33a(4) =5951a(5) =124a(6) =90088a(7) =187a(8) =757a(9) =1149a(10) =237152823a(11) =852a(12) =30744479715a(13) =207737a(14) =15555a(15) =876a(17) =1541a(19) =8454a(20) =3557030a(21) =802103321
External references
- oeis: A350120