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A097643 Numbers n such that n=(d_1!!+d_2!!+...+d_k!!)-(d_1+d_2+...+d_k) where d_1 d_2 ... d_k is the decimal expansion of n. 4

%I #3 Mar 30 2012 17:37:42

%S 4,46,478,944

%N Numbers n such that n=(d_1!!+d_2!!+...+d_k!!)-(d_1+d_2+...+d_k) where d_1 d_2 ... d_k is the decimal expansion of n.

%e 944 is in the sequence because 944=(9!!+4!!+4!!)-(9+4+4).

%Y Cf. A097642.

%K fini,full,base,nonn

%O 1,1

%A _Farideh Firoozbakht_, Aug 23 2004

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)