Numbers k such that 3^k, 3^(k+1) and 3^(k+2) have the same number of digits.

Terms

a(0) =0a(1) =21a(2) =42a(3) =65a(4) =86a(5) =109a(6) =130a(7) =151a(8) =174a(9) =195a(10) =218a(11) =239a(12) =262a(13) =283a(14) =304a(15) =327a(16) =348a(17) =371a(18) =392a(19) =415a(20) =436a(21) =457a(22) =480a(23) =501a(24) =524a(25) =545a(26) =568a(27) =589a(28) =610a(29) =633