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A277650 Numbers with primitive English number names. 0
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 30, 40, 50 (list; graph; refs; listen; history; text; internal format)



A "primitive English number name" is defined here as an English number name whose letters do not fully spell any other English number name.

English number names for all numbers not in this sequence consist of letters that spell at least one of these words: zero, one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirty, forty, fifty. If "zero" is removed from this list, the statement is still true. Any further removals depend upon whether names such as the British "milliard" are permitted; e.g., "eleven milliard" requires "eleven" to stay in the list (lack of a second "n" does not permit "nine" here).


Table of n, a(n) for n=1..16.


The number 13 is not a term because "three" or "ten" can be spelled using the letters in "thirteen". On the other hand, 50 is a term because the letters in "fifty" cannot be used to form any other English number name.


Cf. A005589 (see many English number names).

Sequence in context: A243020 A061921 A342042 * A071786 A151766 A004852

Adjacent sequences:  A277647 A277648 A277649 * A277651 A277652 A277653




Rick L. Shepherd, Oct 25 2016



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Last modified September 18 12:35 EDT 2021. Contains 347527 sequences. (Running on oeis4.)