A129897 a(n) is the integer that results from truncating both e and Pi to n digits, adding the results, and discarding the decimal point.

5, 58, 585, 5859, 58597, 585987, 5859873, 58598744, 585987447, 5859874481, 58598744819, 585987448203, 5859874482048, 58598744820487, 585987448204883, 5859874482048838, 58598744820488384, 585987448204883846, 5859874482048838473, 58598744820488384737

Offset: 0

Author

Kevin J Davis (kevin_j_davis(AT)btinternet.com), Jun 04 2007

Keywords

• nonn
• base
• less

Examples

			From _Jon E. Schoenfield_, Feb 24 2021: (Start)
n=1: 2      + 3      = 5      --> a(1) = 5;
n=2: 2.7    + 3.1    = 5.8    --> a(2) = 58;
n=3: 2.71   + 3.14   = 5.85   --> a(3) = 585;
n=4: 2.718  + 3.141  = 5.859  --> a(4) = 5859;
n=5: 2.7182 + 3.1415 = 5.8597 --> a(5) = 58597; etc.
(End)
		

Crossrefs

Cf. A011543, A011545.

Programs

Mathematica

Module[{nn=20,pi,e},pi=RealDigits[Pi,10,nn][[1]];e=RealDigits[E,10,nn] [[1]]; Table[FromDigits[Take[pi,n]]+FromDigits[Take[e,n]],{n,nn}]] (* Harvey P. Dale, May 28 2016 *)

Formula

a(n) = floor(floor(Pi*10^n) + floor(exp(1)*10^n)), Pi=3.14159..., e=2.71828....

Extensions

Corrected and extended by Harvey P. Dale, May 28 2016