OFFSET
1,2
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A001223(n) mod 4.
MATHEMATICA
Table[Mod[Prime[w+1]-Prime[w], 4], {w, 1, 256}]
Mod[Differences[Prime[Range[200]]], 4] (* Zak Seidov, Jun 26 2015 *)
PROG
(Python)
from sympy import prime
def A080378(n): return (prime(n+1)-prime(n))&3 # Chai Wah Wu, Jul 07 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Mar 04 2003
STATUS
approved