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A072685 Positive integers whose English names contain a prime number of letters. 4

%I

%S 1,2,3,6,7,8,10,15,16,23,27,28,33,37,38,40,50,60,70,74,75,79,83,87,88,

%T 93,97,98,104,105,109,111,112,120,124,125,129,130,134,135,139,143,147,

%U 148,153,157,158,163,167,168,171,172,176,180,184,185,189,190,194,195

%N Positive integers whose English names contain a prime number of letters.

%e First value is 1 because 1 -> "ONE" -> 3 letters and 3 is prime. Numbers >100 use naming convention using "and": 199 -> "ONEHUNDREDANDNINETYNINE" -> 23 letters and 23 is prime.

%K easy,nonn,word

%O 1,2

%A Mark Hudson (mrmarkhudson(AT)hotmail.com), Jul 02 2002

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Last modified January 18 10:33 EST 2022. Contains 350454 sequences. (Running on oeis4.)