A048429 Smallest numerator of a fraction using palindromes that approximates Pi to at least n digits after the decimal point.

22, 22, 666, 666, 1186811, 1633361, 7327237, 204656402, 971292179, 32418381423, 185295592581, 5760554550675, 6259909099526, 148967656769841, 2214599229954122, 48720094949002784, 281261635536162182, 5729095689865909275

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Sean A. Irvine, Java program (github)

Example

a(4)=666 because the ratio of palindromes 666/212 = 3.1415... approximates Pi with four correct digits after the decimal point.

Crossrefs

Denominators in A048430.

Sequence in context: A134443 A165843 A223821 * A336827 A004463 A152835

Adjacent sequences: A048426 A048427 A048428 * A048430 A048431 A048432

Keyword

nonn,frac,more,base

Author

Patrick De Geest, Apr 15 1999

Extensions

a(15)-a(18) from Sean A. Irvine, Jun 17 2021

Status

approved