Position of n-th 8 in A031298.

Terms

a(0) =8a(1) =26a(2) =46a(3) =66a(4) =86a(5) =106a(6) =126a(7) =146a(8) =151a(9) =153a(10) =155a(11) =157a(12) =159a(13) =161a(14) =163a(15) =165a(16) =166a(17) =167a(18) =169a(19) =186a(20) =214a(21) =244a(22) =274a(23) =304a(24) =334a(25) =364a(26) =394a(27) =424a(28) =431a(29) =434