A353179 a(n) is the first nonzero digit in the decimal expansion of 1/prime(n).

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

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Formula

a(n) = A052038(prime(n)).

Maple

a:= n-> (p-> floor(10^length(p)/p))(ithprime(n)):
seq(a(n), n=1..100);  # Alois P. Heinz, Apr 30 2022

Mathematica

Table[RealDigits[1/Prime[n], 10, 1][[1]], {n, 100}]//Flatten (* Harvey P. Dale, Aug 25 2024 *)

Prog

(PARI) a(n) = my(p=prime(n)); floor(10^(1+logint(p-1, 10))/p) \\ Felix Fröhlich, Apr 29 2022

Crossrefs

Cf. A052038, A000040.

Sequence in context: A350041 A317674 A201333 * A088324 A352153 A052038

Adjacent sequences: A353176 A353177 A353178 * A353180 A353181 A353182

Keyword

nonn,easy,base

Author

Firdous Ahmad Mala, Apr 29 2022

Extensions

More terms from Felix Fröhlich, Apr 29 2022

Status

approved