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

2, 5, 59, 1103, 706799, 20979619

Offset

1,1

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

Table of n, a(n) for n=1..6.

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.

Formula

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

Crossrefs

Subset of A007878.

Cf. A000040, A138787.

Sequence in context: A042161 A176142 A101151 * A030244 A004150 A062642

Adjacent sequences: A138785 A138786 A138787 * A138789 A138790 A138791

Keyword

nonn,more

Author

Artur Jasinski, Mar 30 2008

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

Status

approved