A374831 Decimal expansion of Product_{p prime} (1 - (1/(p*(p - 1)))*p^2/(p^2 + 1)).

4, 5, 8, 9, 3, 7, 4, 9, 8, 5, 0, 5, 4, 3, 5, 9, 6, 1, 3, 0, 6, 3, 4, 2, 6, 1, 8, 1, 0, 0, 1, 8, 9, 3, 8, 5, 6, 7, 2, 0, 0, 8, 1, 6, 3, 7, 4, 5, 2, 8, 9, 8, 1, 2, 3, 4, 2, 8, 7, 5, 7, 7, 7, 7, 3, 1, 7, 5, 4, 5, 6, 6, 1, 2, 2, 5, 4, 3, 0, 8, 5, 8, 9, 2, 2, 8, 6, 2, 5, 4, 3, 2, 0, 9, 3, 5, 8, 0, 7, 8, 2, 5, 7, 2, 9

Offset

0,1

Links

Table of n, a(n) for n=0..104.

Rafael Jakimczuk, Numbers of the form p-1 where p is prime, July 2024. See p. 23.

Example

0.4589374985054359613063426181...

Prog

(PARI) prodeulerrat(1-p^2/(p*(p-1)*(p^2+1)))

Crossrefs

Cf. A005596, A005597, A065414, A065418, A065419, A374830 (lower bound).

Sequence in context: A154885 A292192 A339499 * A377203 A295150 A358819

Adjacent sequences: A374828 A374829 A374830 * A374832 A374833 A374834

Keyword

nonn,cons

Author

Stefano Spezia, Jul 21 2024

Status

approved