a fact which Gardner (1997) calls a remarkable pattern that is entirely accidental and leads nowhere. ， 2， 6。
17。
3。
3333331， 331， ... 3s followed by a 1 has its th term is given by The result is prime for ， 7， 31， 3 is the only integer which is the sum of the preceding positive integers ( ) and the only number which is the sum of the factorials of the preceding positive integers ( ). It is also the first odd prime. A quantity taken to the power 3 is said to be cubed. The sequence 1。
33331， 39， 3331， 1， 5， ... (OEIS A055520); i.e.，。
for 31， ... (OEIS A051200)， 33333331， 331， 3331， 333331。
33331， ... (OEIS A033175) consisting of ， 4。