I got tired of solving these problems. So, I just wrote a solution that works for everything.
Back to basics 23 - Triangular matrix
Removing rows from a matrix is easy - but what about inserting rows?
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
Sum of series I
Lights Out 2 - 5x5, 4 moves
Lights Out 11 - 5x5, with wrapping, x moves
Divisible by n, prime divisors from 20 to 200
Power Times (of the day)
Self-similarity 2 - Every third term
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