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

%I #5 Mar 30 2012 17:36:37

%S 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

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

%C 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.

%e 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.

%Y Cf. A048659. A074322 gives another version.

%K fini,full,nonn,word

%O 1,1

%A _Rick L. Shepherd_, Feb 09 2002

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Last modified August 26 07:40 EDT 2024. Contains 375454 sequences. (Running on oeis4.)