28735domain: NAppears in sequences-arctan(arcsin(x)-arctanh(x))=1/3!*x^3+15/5!*x^5+495/7!*x^7+28735/9!*x^9...at n=4A013433Numbers whose base-13 representation has exactly 5 runs.at n=4A043660Numbers whose set of base 8 digits is {0,7}.at n=19A097254