Position of n-th 8 in A031087.

Terms

a(0) =8a(1) =25a(2) =43a(3) =61a(4) =79a(5) =97a(6) =115a(7) =133a(8) =136a(9) =138a(10) =140a(11) =142a(12) =144a(13) =146a(14) =148a(15) =150a(16) =151a(17) =152a(18) =177a(19) =204a(20) =231a(21) =258a(22) =285a(23) =312a(24) =339a(25) =366a(26) =370a(27) =373a(28) =376a(29) =379