A008540 Numbers whose American English name contains the letter 'f'.

4, 5, 14, 15, 24, 25, 34, 35, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 64, 65, 74, 75, 84, 85, 94, 95, 104, 105, 114, 115, 124, 125, 134, 135, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158

Offset

1,1

Links

Paolo Xausa, Table of n, a(n) for n = 1..10000

Mathematica

A008540Q[n_]:=StringContainsQ[IntegerName[n, "Words"], "f"]; Select[Range[0, 200], A008540Q] (* Paolo Xausa, Aug 12 2023 *)

Crossrefs

Cf. A008519 (o), A008520 (e), A008522 (t), A008536 (n), A008538 (s), A008553 (y).

Sequence in context: A195747 A238315 A091311 * A290810 A000867 A191142

Adjacent sequences: A008537 A008538 A008539 * A008541 A008542 A008543

Keyword

nonn,word

Author

N. J. A. Sloane

Extensions

Name edited by Paolo Xausa, Aug 12 2023

Status

approved