A231075 Primes with a prime number of letters (A005589) in their (American) English name.

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, 1013, 1019, 1051, 1061, 1129, 1151, 1153, 1163, 1171

Offset

1,1

Comments

Spaces and hyphens don't count, as in A005589. See A163648 and A231073 for the analogs counting syllables resp. words.

Sequence A072686 is the British English analog, which in particular uses the additional "and": It features "one hundred and nine", but not "one hundred and one". In the present sequence, we do have "one hundred one" but not "one hundred nine".

Links

Table of n, a(n) for n=1..50.

Index entries for sequences related to number of letters in n

Prog

(PARI) is(p)=isprime(A005589(p))&&isprime(p)
(PARI) forprime(p=1, 1200, isprime(A005589(p))&&print1(p", "))

Crossrefs

Sequence in context: A061712 A059661 A214704 * A072686 A002230 A106865

Adjacent sequences: A231072 A231073 A231074 * A231076 A231077 A231078

Keyword

nonn,word

Author

M. F. Hasler, Nov 03 2013

Status

approved