Position of n-th 6 in A031035.

Terms

a(0) =6a(1) =21a(2) =37a(3) =53a(4) =69a(5) =85a(6) =88a(7) =90a(8) =92a(9) =94a(10) =96a(11) =98a(12) =100a(13) =101a(14) =102a(15) =117a(16) =140a(17) =164a(18) =188a(19) =212a(20) =236a(21) =260a(22) =265a(23) =268a(24) =271a(25) =274a(26) =277a(27) =280a(28) =283a(29) =284