Delete all letters except c, d, i, l, m, v, x from the US English name of n, then read as Roman numeral if possible, otherwise 0.

A002904

Delete all letters except c, d, i, l, m, v, x from the US English name of n, then read as Roman numeral if possible, otherwise 0.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =4a(5) =9a(6) =5a(7) =1a(8) =1a(9) =0a(10) =55a(11) =55a(12) =1a(13) =0a(14) =1a(15) =9a(16) =5a(17) =1a(18) =1a(19) =0a(20) =0a(21) =0a(22) =0a(23) =0a(24) =4a(25) =9a(26) =5a(27) =1a(28) =1a(29) =1

External references