A054638 0 if pronounced name of n-th letter of English alphabet begin with a vowel sound, otherwise 1. Different from A074322.

0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1

Offset

1,1

Comments

Three curious properties: (1) 13 0's and 13 1's, (2) Sequence is equivalent to the concatenation of its three non-overlapping, consecutive subsequences of lengths 5, 16 and 5, where each of the three subsequences is palindromic (for example, a(6),...,a(21) = 0,1,0,0,1,1,0,0,0,0,1,1,0,0,1,0). (3) "5, 16, 5" is also palindromic.

Links

Table of n, a(n) for n=1..26.

Example

a(8)=0 because the name of "h", the 8th letter of the English alphabet, is pronounced with an initial (long) "a" sound (plus "ch"). Because "a" is a vowel, a(8)=0. a(26)=1 because the name of "z", the 26th letter, is pronounced with an initial "z" sound (whether as z plus long-e sounds (e.g. U.S.A.) or as "zed" (Brit.)) and "z" is a consonant, denoted by 1 here.

Crossrefs

Cf. A048659. A074322 gives another version.

Sequence in context: A356313 A309218 A189718 * A074322 A284935 A118249

Adjacent sequences: A054635 A054636 A054637 * A054639 A054640 A054641

Keyword

fini,full,nonn,word

Author

Rick L. Shepherd, Feb 09 2002

Status

approved