A240083 Numbers n such that k^n-(k-1)^n-...-3^n-2^n is prime for some k.

1, 2, 3, 4, 5, 10, 11, 13, 15, 16, 17, 18, 19, 21, 22, 24, 26, 27, 28, 29, 31, 32, 33, 35, 41, 45, 46, 47, 48, 49, 53, 55, 57, 58, 59, 61, 65, 67, 71, 76, 82, 83, 87, 88, 89, 91, 93, 94, 99, 101, 103, 107, 108, 110, 111, 114, 115, 116, 119, 123, 127, 130, 132, 134, 138, 141

Offset

1,2

Comments

Also numbers n such that A239472(n) > 0.

Links

Table of n, a(n) for n=1..66.

Prog

(Python)
import sympy
from sympy import isprime
def Lep(n):
..for k in range(2*10**3):
....num = k**n
....for i in range(2, k):
......num -= i**n
......if num < 0:
........return None
....if isprime(num):
......return k
n = 1
while n < 10**3:
..if Lep(n) != None:
....print(n)
..n += 1
(PARI) a(n)=k=1; while((s=k^n-sum(i=2, k-1, i^n))>0, if(isprime(s), return(k)); k++)
for(n=1, 100, if(a(n), print1(n, ", "))) \\ Derek Orr, Mar 12 2015

Crossrefs

Cf. A239472.

Sequence in context: A089964 A210495 A179302 * A066996 A126427 A032860

Adjacent sequences: A240080 A240081 A240082 * A240084 A240085 A240086

Keyword

nonn

Author

Derek Orr, Mar 31 2014

Status

approved