A121760/1: two (interesting?) sequences

[Ralf Stephan]

I agree those are not base but wasn't there a rule to only
include the first five of sequences containing an arbitrary
number (OK the first ten or more for really important ones)? 

>     A039303, Number of distinct quadratic residues mod 6^n. 	
>     A039304, Number of distinct quadratic residues mod 7^n. 	
>     A039305, Number of distinct quadratic residues mod 8^n. 
>     A039306, Number of distinct quadratic residues mod 9^n. 	
>     A000993, Number of distinct quadratic residues mod 10^n = number of
>              distinct n-digit endings of base 10 squares. 
> 
> Maybe also:
> 
>     A008975	Pascal's triangle mod 10
>     A074822	Primes p(n) such that p(n) + 4 = p(n+1) and p(n) == 9 (Mod 10)
>     A087355	n^10 mod 10^n