[math-fun] An easy August sequence riddle

Hello Math-Fun, this is a permutation of the integers from 1 to 35; what are the next two terms? one, FOUR, two, three, FIVE, NINE, ELEVEN, TWELVE, six, seven, eight, ten, THIRTEEN, FOURTEEN, fifteen, sixteen, seventeen, EIGHTEEN, NINETEEN, TWENTY, twenty-one, twenty-two, twenty-three, TWENTY-FOUR, TWENTY-FIVE, TWENTY-NINE, THIRTY, THIRTY-FOUR, twenty-six, twenty-seven, twenty-eight, thirty-one, thirty-two, thirty-three, THIRTY-FIVE,... Best, É.