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  • \$\begingroup\$ It's not a valid function, 10.3 complains about a rogue @ at the end \$\endgroup\$ Commented Apr 18, 2016 at 5:29
  • \$\begingroup\$ @ is calling the argument, I don't know why it was there, just a quick edit \$\endgroup\$ Commented Apr 18, 2016 at 5:32
  • \$\begingroup\$ Gotta be careful :) \$\endgroup\$ Commented Apr 18, 2016 at 16:51
  • \$\begingroup\$ This function has max recursion depth 1024. The first value for which it fails is 2610744987 because it needs 1050 steps. Try it online! \$\endgroup\$ Commented Jul 28, 2021 at 11:49