A060403 Each term is the previous term plus the number of letters in the previous number, as conventionally spelled out in American English.

1, 4, 8, 13, 21, 30, 36, 45, 54, 63, 73, 85, 95, 105, 119, 137, 158, 178, 200, 210, 223, 244, 263, 283, 304, 320, 338, 361, 381, 402, 416, 434, 455, 475, 497, 519, 538, 560, 576, 597, 619, 637, 658, 678, 700, 712, 730, 748, 770, 789, 811, 829, 851, 871, 893

Offset

1,2

Comments

Increases more slowly than A160395 since American English does not use 'and' to separate hundreds from the rest of the number. E.g., 619 = "six hundred nineteen" in American English but "six hundred and nineteen" in British English. - Carl R. White, May 12 2009

References

GCHQ, The GCHQ Puzzle Book, Penguin, 2016. See pages 49 and 214.

Links

Michael De Vlieger, Table of n, a(n) for n = 1..10001

Example

a(2)=4 because a(1)=1 and 4 is 1 plus the number of letters in "one," 3.

Mathematica

NestList[#+Length[Select[Characters[IntegerName[#, "Words"]], LetterQ ]]&, 1, 54] (* James C. McMahon, Jul 30 2024 *)

Crossrefs

Cf. A005589 See A139097 for another version.

For British English see A160395. - Carl R. White, May 12 2009

Sequence in context: A312219 A312220 A335445 * A139097 A160395 A038793

Adjacent sequences: A060400 A060401 A060402 * A060404 A060405 A060406

Keyword

nonn,word,easy

Author

Kevin Langdon (kevin.langdon(AT)polymath-systems.com), Apr 05 2001

Extensions

More terms from Carl R. White, May 12 2009

Status

approved