a(n) = 4*b_4(n)+3, where b_4 lists the indices of zeros of the sequence A261304: u(n) = abs(u(n-1)-gcd(u(n-1),4*n-1)), u(1) = 1.
A186256
a(n) = 4*b_4(n)+3, where b_4 lists the indices of zeros of the sequence A261304: u(n) = abs(u(n-1)-gcd(u(n-1),4*n-1)), u(1) = 1.
Terms
- a(0) =11a(1) =59a(2) =251a(3) =1259a(4) =6299a(5) =31387a(6) =152083a(7) =758971a(8) =3790651a(9) =18953251a(10) =94766251a(11) =473831251a(12) =2369156107a(13) =11845755043a(14) =59228775043a(15) =296143874947
External references
- oeis: A186256