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A072686 Prime numbers whose (British) English names have a prime number of letters. 4
2, 3, 7, 23, 37, 79, 83, 97, 109, 139, 157, 163, 167, 199, 211, 229, 239, 257, 263, 271, 313, 401, 421, 431, 449, 491, 503, 521, 569, 643, 647, 653, 709, 719, 751, 761, 809, 907, 991, 1021, 1031, 1049, 1069, 1091, 1103, 1301, 1303, 1307, 1327, 1409, 1511 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

See A231075 for the American English version. The sequences coincide up to a(8)=97 but are then completely different, due to the additional "and" (e.g. in "one hundred and nine") in the British style. - M. F. Hasler, Nov 03 2013

LINKS

Table of n, a(n) for n=0..50.

Index entries for sequences related to number of letters in n

EXAMPLE

e.g. 2003 -> "TWOTHOUSANDANDTHREE" -> 19 letters and 19 is prime. Note that the "and" naming convention is used; e.g. "ONE HUNDRED AND ONE", "ONE THOUSAND NINE HUNDRED AND SEVENTY THREE".

CROSSREFS

Prime elements of A072685.

Sequence in context: A059661 A214704 A231075 * A002230 A106865 A267504

Adjacent sequences:  A072683 A072684 A072685 * A072687 A072688 A072689

KEYWORD

easy,nonn,word

AUTHOR

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

STATUS

approved

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Last modified March 19 15:02 EDT 2019. Contains 321330 sequences. (Running on oeis4.)