A242828 Primes formed by the initial digits of the decimal expansion of 1/17, starting at the first nonzero digit in the expansion.

5, 5882352941, 588235294117, 588235294117647058823529411764705882352941176470588235294117

Offset

1,1

Comments

There is no other term with 126 or fewer digits.

No more terms < 10^20000. - Jon E. Schoenfield, Nov 02 2019

Links

Table of n, a(n) for n=1..4.

Mathematica

Select[Table[FromDigits[PadRight[{}, n, {5, 8, 8, 2, 3, 5, 2, 9, 4, 1, 1, 7, 6, 4, 7, 0}]], {n, 60}], PrimeQ] (* Harvey P. Dale, Aug 08 2021 *)

Prog

(PARI) lista(nn) = {v = [5, 8, 8, 2, 3, 5, 2, 9, 4, 1, 1, 7, 6, 4, 7, 0]; n = 0; for (i=0, nn, n = 10*n+ v[(i % 16)+1]; if (ispseudoprime(n), print1(#Str(n), ", ")); ); } \\ Michel Marcus, May 27 2014

Crossrefs

Cf. A007450.

Corresponding sequences for 1/k: A242824 (k=7), A093676 (k=12), A242826 (k=13), A242827(k=14), A242833 (k=19).

Sequence in context: A115763 A052000 A094467 * A177164 A324220 A273941

Adjacent sequences: A242825 A242826 A242827 * A242829 A242830 A242831

Keyword

nonn,base

Author

Felix Fröhlich, May 23 2014

Status

approved