What's 15?

Number Theory Level pending

If \(1\implies 2468\)

\(2\implies 15\)

\(3\implies 76857\)

\(4\implies -897\)

\(5\implies 13546\)

\(6\implies -8\)

\(7\implies 0\)

\(8\implies 89\)

\(9\implies 864\)

\(10\implies 554\)

\(11\implies 78\)

\(12\implies 888888\)

\(13\implies 216\)

\(14\implies 196\)

\(15\implies ?\)

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