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A097425 a(1) = 500, then a(n) is the concatenation of the roman numerals (I, V, X, L, C, D, M) visible in a(n-1) written in English. 0

%I

%S 500,15500500,1510001505011550050050015500500

%N a(1) = 500, then a(n) is the concatenation of the roman numerals (I, V, X, L, C, D, M) visible in a(n-1) written in English.

%e a(1) = 500, which is fIVe hunDreD, so a(2) = concat(1, 5, 500, 500) = 15500500, which is fIVeteen MILLIon fIVe hunDreD thousanD fIVe hunDreD, so a(3) = concat(1, 5, 1000, 1, 50, 50, 1, 1, 5, 500, 500, 500, 1, 5, 500, 500), etc.

%Y Cf. A002904, A092302.

%K nonn,word,less

%O 1,1

%A _Pierre CAMI_, Aug 21 2004

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Last modified August 17 12:09 EDT 2022. Contains 356189 sequences. (Running on oeis4.)