A055508 H is the first, fifth, sixteenth, ..., letter in the sequence not counting spaces and commas.

1, 5, 16, 25, 36, 38, 47, 49, 57, 59, 71, 81, 93, 103, 119, 134, 141, 149, 156, 172, 176, 184, 194, 198, 218, 234, 238, 254, 258, 281, 299, 303, 313, 321, 325, 343, 347, 363, 365, 369, 379, 385, 389, 397, 407, 411, 419, 427, 429, 433, 450, 454, 469, 471, 475

Offset: 1

Author

Robert G. Wilson v, Jun 29 2000

Keywords

• easy
• nonn
• word

Comments

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.

Crossrefs

Cf. A005224 and A049525.