A119960 Positive integers with prime number of characters in their English names, including spaces and hyphens.

1, 2, 3, 6, 7, 8, 10, 15, 16, 24, 25, 29, 34, 35, 39, 40, 43, 47, 48, 50, 53, 57, 58, 60, 63, 67, 68, 70, 71, 72, 73, 76, 77, 78, 84, 85, 89, 94, 95, 99

Offset: 1

Author

Jonathan Vos Post, Aug 02 2006

Keywords

• easy
• nonn
• word

Comments

Differs due to hyphens and spaces from A072685 Positive integers whose English names contain a prime number of letters. Primes with prime number of characters in their English names, including spaces and hyphens, are a subset of this beginning: 2, 3, 7, 29, 43, 47, 53, 67, 71, 73.

Crossrefs

Cf. A000040, A052360, A005589, A052362-A052363, A072685.

Programs

Mathematica

Select[Range[99], PrimeQ[ StringLength@ IntegerName[#, "Words"]] &] (* Giovanni Resta, Jun 13 2016 *)

Formula

n such that A052360(n) is prime. n such that A052360(n) is in A000040.

Extensions

Missing a(1) and more terms from Giovanni Resta, Jun 13 2016