Somebody asked this question on Quora. I thought I’d give it a try.
The next number is 37.
This is a list of prime numbers whose English names have a prime number of letters.
Note: This counts letters only, not hyphens or spaces.
| Number | Spelling | Letters |
|---|---|---|
| 2 | two | 3 |
| 3 | three | 5 |
| 7 | seven | 5 |
| 23 | twenty-three | 11 |
| 37 | thirty-seven | 11 |
| 79 | seventy-nine | 11 |
| 83 | eighty-three | 11 |
| 97 | ninety-seven | 11 |
Here’s a list of all the prime numbers whose English names have a prime number of letters up to one thousand:
2, 3, 7, 23, 37, 79, 83, 97, 101, 131, 149, 181, 191, 269, 281, 307, 337, 379, 383, 397, 419, 461, 541, 577, 601, 617, 631, 659, 691, 727, 733, 787, 797, 823, 827, 883, 887, 911, 919, 941, 977
Just for fun:
| Number | Spelling | Letters |
|---|---|---|
| 999999999999883 | nine hundred ninety-nine trillionnine hundred ninety-nine billionnine hundred ninety-nine millionnine hundred ninety-nine thousandeight hundred eighty-three | 137 |