OFFSET
1,2
COMMENTS
This is a periodic sequence with period 20 which is twice the considered radix.
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1).
FORMULA
a(n) = n^(n-1) mod 10.
a(n) = A365935(n+10).
EXAMPLE
For n = 4, a(4) = 4^3 mod 10 = 64 mod 10 = 4.
MATHEMATICA
a[n_]:=Last[IntegerDigits[n^(n-1)]]; Array[a, 87] (* Stefano Spezia, Sep 26 2023 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Marco Ripà, Sep 23 2023
STATUS
approved