Position of n-th 6 in A030998.

Terms

a(0) =6a(1) =20a(2) =34a(3) =48a(4) =62a(5) =76a(6) =77a(7) =79a(8) =81a(9) =83a(10) =85a(11) =87a(12) =89a(13) =90a(14) =111a(15) =132a(16) =153a(17) =174a(18) =195a(19) =216a(20) =218a(21) =221a(22) =224a(23) =227a(24) =230a(25) =233a(26) =236a(27) =237a(28) =258a(29) =279