A095709 Triangle of numbers obtained by reversing the first n digits of Pi and juxtaposing.

3, 1, 3, 4, 1, 3, 1, 4, 1, 3, 5, 1, 4, 1, 3, 9, 5, 1, 4, 1, 3, 2, 9, 5, 1, 4, 1, 3, 6, 2, 9, 5, 1, 4, 1, 3, 5, 6, 2, 9, 5, 1, 4, 1, 3, 3, 5, 6, 2, 9, 5, 1, 4, 1, 3, 5, 3, 5, 6, 2, 9, 5, 1, 4, 1, 3, 8, 5, 3, 5, 6, 2, 9, 5, 1, 4, 1, 3, 9, 8, 5, 3, 5, 6, 2, 9, 5, 1, 4, 1, 3, 7, 9, 8, 5, 3, 5, 6, 2, 9, 5, 1, 4, 1, 3

Offset

1,1

Links

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

Example

Triangle begins:
  3;
  1,3;
  4,1,3;
  1,4,1,3;
  5,1,4,1,3;
  ... (reverse order of 3; 3.1; 3.14; 3.141; 3.1415; ...)

Mathematica

Module[{nn=20, pid}, pid=RealDigits[Pi, 10, (nn(nn+1))/2][[1]]; Table[ Reverse[ Take[ pid, n]], {n, nn}]]//Flatten (* Harvey P. Dale, Aug 13 2019 *)

Prog

(PARI) a(n)=if(n<1, 0, default(realprecision, n+2); floor(Pi*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. A000796.

Sequence in context: A130560 A088105 A030708 * A076152 A107638 A245093

Adjacent sequences: A095706 A095707 A095708 * A095710 A095711 A095712

Keyword

base,easy,nonn,tabl

Author

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

Status

approved