OFFSET
1,2
FORMULA
a(n) = 0 for n in A238204. - Michel Marcus, Feb 08 2020 [Proof: a(n) = 1 iff n - 1 is a prime because n^k - 1 is divisible by n - 1, where k > 1 and n is an even number greater than 2. But if n is a term in A238204, n - m is prime only for some m >= 3. Therefore, a(n) = 0 for n in A238204. - Jinyuan Wang, Feb 08 2020]
CROSSREFS
KEYWORD
nonn
AUTHOR
Todor Szimeonov, Feb 05 2020
EXTENSIONS
More terms from Jinyuan Wang, Feb 07 2020
STATUS
approved