A097643 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

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.

%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