A119666 Each term k provides a value of (sum-of-digits of 5^k)/k that is closer to Pi than the previous value.

1, 2, 4, 6, 8, 139, 309, 390, 819, 2868, 6751, 8045, 9414, 15008, 15375, 56839, 84383, 151286, 307650, 516962, 533919, 2021009

Offset

1,2

Links

Table of n, a(n) for n=1..22.

Hans Havermann, Search for the next term.

Mathematica

a = Infinity; fn = 1; p = N[Pi, 24]; Do[ fn = 5fn; b = N[ Abs[Pi - Plus @@ IntegerDigits@fn/n], 24]; If[b < a, a = b; Print@n], {n, 711000}] (* Robert G. Wilson v, Sep 08 2007 *)

Crossrefs

Sequence in context: A228327 A081507 A115336 * A087302 A351777 A030149

Adjacent sequences: A119663 A119664 A119665 * A119667 A119668 A119669

Keyword

base,fini,nonn,more

Author

Hans Havermann, Jul 29 2006, Jul 31 2006, Aug 05 2006

Status

approved