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

Author

Jonathan Vos Post, May 25 2014

Keywords

• nonn
• word
• easy

Examples

			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.
		

Crossrefs

Cf. A000796, A005589, A052384, A107488.

Programs

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

Formula

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

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