A242898 Cumulative number of letters in decimal expansion of Pi being spoken in English as "Three Point One Four One...".

5, 10, 13, 17, 20, 24, 28, 31, 34, 38, 43, 47, 52, 56, 61, 65, 70, 73, 78, 83, 87, 90, 93, 96, 100, 105, 110, 115, 120, 123, 128, 132, 136, 140, 143, 148, 153, 157, 160, 164, 169, 172, 175, 179, 184, 188, 192, 197, 202, 206, 209, 213, 217, 222, 225, 229, 233

Offset

1,1

Links

Table of n, a(n) for n=1..57.

Formula

a(n) = 5 + SUM[i=1..n-1] A005589(A000796(i)).

a(n) = 5 + SUM[i=1..n-1] A107488(i).

Example

a(1) = 5 because "Three" has five letters;
a(2) = 10 because "Three Point" has ten letters;
a(3) = 13 because "Three Point One" has thirteen letters.

Maple

A242898 := proc(n)
    5+add(A052384(i), i=1..n-1) ;
end proc:
seq(A242898(n), n=1..57) ; # R. J. Mathar, Jun 30 2020

Crossrefs

Cf. A000796, A005589, A052384, A107488.

Sequence in context: A277269 A185450 A072284 * A230486 A024507 A004431

Adjacent sequences: A242895 A242896 A242897 * A242899 A242900 A242901

Keyword

nonn,word,easy

Author

Jonathan Vos Post, May 25 2014

Status

approved