Index of first occurrence of n appearing twice in succession in van Eck's sequence (A181391), or 0 if it never occurs.
A308782
Index of first occurrence of n appearing twice in succession in van Eck's sequence (A181391), or 0 if it never occurs.
Terms
- a(0) =2a(1) =0a(2) =8a(3) =50a(4) =132a(5) =414a(6) =171a(7) =659a(8) =96a(9) =361a(10) =12311a(11) =7224a(12) =5896a(13) =2954a(14) =5804a(15) =72387a(16) =12756a(17) =1292a(18) =4332a(19) =3715a(20) =2704a(21) =1887a(22) =5780a(23) =9837a(24) =11721a(25) =1094a(26) =70067a(27) =32610a(28) =57658a(29) =26146
External references
- oeis: A308782