What comes next in the sequence 2, 3, 7, 23, …?

By | June 27, 2019

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

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