A138788 a(n) = A007878(prime(n)).

2, 5, 59, 1103, 706799, 20979619, 21976689397

Offset: 1

Author

Artur Jasinski, Mar 30 2008

Keywords

• nonn
• more

Comments

Previous name was: Number of monomials in discriminant of symbolic polynomial of prime degree with all nonzero coefficients.

Conjecture: All numbers in this sequence are primes.

This conjecture is false, A007878(11) = 706799 = 41 * 17239. - Vaclav Kotesovec, Mar 29 2019

Links

• Mohammad K. Azarian, On the Hyperfactorial Function, Hypertriangular Function, and the Discriminants of Certain Polynomials, International Journal of Pure and Applied Mathematics 36(2), 2007, pp. 251-257. MR2312537. Zbl 1133.11012.

Crossrefs

Subset of A007878.

Cf. A000040, A138787.

Formula

a(n) = A007878(prime(n)).

Extensions

a(5) from Vaclav Kotesovec, Mar 29 2019

New name using formula from Joerg Arndt, Sep 07 2023

a(6) from Seiichi Manyama, Nov 08 2023

a(7) from the data at A007878 added by Amiram Eldar, Oct 24 2024