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H is the first, fifth, sixteenth, ..., letter in the sequence not counting spaces and commas.
6

%I #3 Mar 30 2012 17:30:21

%S 1,5,16,25,36,38,47,49,57,59,71,81,93,103,119,134,141,149,156,172,176,

%T 184,194,198,218,234,238,254,258,281,299,303,313,321,325,343,347,363,

%U 365,369,379,385,389,397,407,411,419,427,429,433,450,454,469,471,475

%N H is the first, fifth, sixteenth, ..., letter in the sequence not counting spaces and commas.

%C Along with the letters "T" and "I", this completes the series, i.e. no other letters in the alphabet can substain a sequence with such a definition.

%Y Cf. A005224 and A049525.

%K easy,nonn,word

%O 1,2

%A _Robert G. Wilson v_, Jun 29 2000