Position of n-th 6 in A031298.

Terms

a(0) =6a(1) =22a(2) =42a(3) =62a(4) =82a(5) =102a(6) =111a(7) =113a(8) =115a(9) =117a(10) =119a(11) =121a(12) =122a(13) =123a(14) =125a(15) =127a(16) =129a(17) =142a(18) =162a(19) =182a(20) =208a(21) =238a(22) =268a(23) =298a(24) =328a(25) =358a(26) =371a(27) =374a(28) =377a(29) =380