a(n) = 2*b(n)+1, where b(n) lists the zeros of the sequence u(n)=abs(u(n-1)-gcd(u(n-1),2*n-1)), u(1)=1.
A186254
a(n) = 2*b(n)+1, where b(n) lists the zeros of the sequence u(n)=abs(u(n-1)-gcd(u(n-1),2*n-1)), u(1)=1.
Terms
- a(0) =5a(1) =17a(2) =53a(3) =149a(4) =449a(5) =1289a(6) =3761a(7) =11261a(8) =33773a(9) =101117a(10) =302681a(11) =907757a(12) =2723069a(13) =8169137a(14) =24506597a(15) =73519793a(16) =220559369a(17) =661677761a(18) =1985001917a(19) =5955003077a(20) =17865008333a(21) =53595020201a(22) =160785060361a(23) =482355180761
External references
- oeis: A186254