A256109 Index of the n-th zero in the first occurrence of a string of exactly n zeros in the decimal expansion of Pi.

33, 309, 604, 13394, 17539, 1699933, 3794579, 172330858, 2542542111, 8324296445, 371247087583, 1755524129985, 3186699229903, 6381820482345

Offset

1,1

Comments

a(n) is the least k such that A000796(k-n+1) = ... = A000796(k) = 0 and A000796(k+1) != 0. - Danny Rorabaugh, Mar 31 2015

Links

Table of n, a(n) for n=1..14.

Dave Andersen, The Pi-Search Page.

Formula

a(n) = A050279(n) + n. - Danny Rorabaugh, Mar 31 2015

Prog

(PARI) { default(realprecision, 20080); for (m = 1, 10, x = Pi; r = 0; for (n = 1, 20000, d = floor(x); x = (x-d)*10; if(d <> 0, if (r <> m, r = 0, print1(n-1, ", "); r = 0; break), r = r + 1)))}

Crossrefs

Cf. A000796, A050279, A014976, A256160.

Sequence in context: A222726 A024400 A297492 * A241966 A210077 A210070

Adjacent sequences: A256106 A256107 A256108 * A256110 A256111 A256112

Keyword

nonn,base,more

Author

Kival Ngaokrajang, Mar 14 2015

Extensions

a(6)-a(10) by Danny Rorabaugh, Mar 31 2015

a(11)-a(14) added using A050279 by Jinyuan Wang, Mar 30 2020

Status

approved