A095711 Triangle of numbers obtained by reversing the first n digits of e and juxtaposing.

2, 7, 2, 1, 7, 2, 8, 1, 7, 2, 2, 8, 1, 7, 2, 8, 2, 8, 1, 7, 2, 1, 8, 2, 8, 1, 7, 2, 8, 1, 8, 2, 8, 1, 7, 2, 2, 8, 1, 8, 2, 8, 1, 7, 2, 8, 2, 8, 1, 8, 2, 8, 1, 7, 2, 4, 8, 2, 8, 1, 8, 2, 8, 1, 7, 2, 5, 4, 8, 2, 8, 1, 8, 2, 8, 1, 7, 2, 9, 5, 4, 8, 2, 8, 1, 8, 2, 8, 1, 7, 2, 0, 9, 5, 4, 8, 2, 8, 1, 8, 2, 8, 1, 7, 2

Offset

1,1

Links

Table of n, a(n) for n=1..105.

Example

2; 7,2; 1,7,2; 8,1,7,2; 2,8,1,7,2;... (reverse order of 2; 2.7; 2.71; 2.718; 2.7182;...)

Mathematica

Module[{nn=20, e}, e=RealDigits[E, 10, (nn(nn+1))/2][[1]]; Reverse/@Table[ Take[ e, n], {n, nn}]]//Flatten (* Harvey P. Dale, Apr 19 2020 *)

Prog

(PARI) a(n)=if(n<1, 0, default(realprecision, n+2); floor(exp(1)*10^(n-1))%10); b(n)=1+binomial(1+floor(1/2+sqrt(2*n)), 2)-n; for(n=1, 120, print1(a(b(n)), ", ")

Crossrefs

Cf. A001113.

Sequence in context: A195726 A095194 A254251 * A102886 A204382 A072981

Adjacent sequences: A095708 A095709 A095710 * A095712 A095713 A095714

Keyword

base,easy,nonn,tabl

Author

Herman Jamke (hermanjamke(AT)fastmail.fm), Jul 07 2004

Status

approved