1,2

Table of n, a(n) for n=1..82.

Dario Alpern, Factorization using the Elliptic Curve Method.

FactorDB, Status of 431^83+1.

a(n) = A001221(A062006(n)).

A000040(10)^10+1 = 29^10+1 = 420707233300202 = 2*421*1061*470925821, therefore a(10) = 4 and A069465(10) = 4.

Table[PrimeNu[Prime[n]^n + 1], {n, 1, 50}] (* G. C. Greubel, May 08 2017 *)

(PARI) a(n) = omega(prime(n)^n+1); \\ Michel Marcus, Feb 17 2020

Cf. A001221, A062006, A069461, A069465.

Sequence in context: A325811 A324380 A123182 * A156723 A240834 A256993

Adjacent sequences: A069461 A069462 A069463 * A069465 A069466 A069467

nonn

Reinhard Zumkeller, Mar 24 2002

More terms from Hugo Pfoertner, May 21 2004

a(36) corrected and a(46)-a(82) added using factordb.com by Amiram Eldar, Feb 17 2020

approved