Trying to change array value in MIPS assembly - arrays

Question

I was hoping that I could get some help debugging some code. I am going to try to not make this a It is for a MIPS assembly project in recursion. The program is only supposed to print prime numbers.
The idea is I have two arrays, one that lists every whole number up to 110, and the other as a flag array that is initialized to all ones.
For every position in the flag array that is a 1 it prints the number and every 0 it doesn't print the number. The good news is I figured out issues with all my loops, the issue I am having is saving the value 0 to the flag array at the position it currently is. Everything that I reference talks about using:
sw [register], ([register])
From what I understand that is how you save the contents of one register to the position of the other? It doesn't seem to work for me. I went ahead and posted the code down bellow, It is kind of messy and really long, but my code for recursion is down where it says Eratosthenes.
.data
NUM_ARRAY: .space 800 # 800-byte memory space
FLAG_ARRAY: .space 800 # 800-byte memory space
START_MSG: .asciiz "The prime numbers up to 110 are:\n"
END_MSG: .asciiz "Completed ...."
SPACE: .asciiz " "
NEWLINE: .asciiz "\n"
BUG1: .asciiz "Out of loop"
INK: .asciiz "incrementK"
INX: .asciiz "incrementX"
.text
.globl main
# THE BEGINNING OF MODULE MAIN #######################
main:
# save the ten registers --------------------------
subu $sp, $sp, 48 # stack frame for 12 registers
sw $ra, ($sp)
sw $s0, 4($sp)
sw $s1, 8($sp)
sw $s2, 12($sp)
sw $s4, 16($sp)
sw $s5, 20($sp)
sw $t0, 24($sp)
sw $t1, 28($sp)
sw $t2, 32($sp)
sw $v0, 36($sp)
sw $a0, 40($sp)
# initialize the essential parameters -------------
li $s0, 111 # the largest number (always - 1)
li $s1, 10 # the square-root of $s0 register
li $s2, 2 # the initial value for "k"
li $s4, 0 # the first numbers to consider
li $s5, 1 # '1' - it is a prime number
li $t2, 0 # loop ounter
# show an opening message ---------------------------------
li $v0, 4 # system call #4
la $a0, START_MSG
syscall
# initialize the two arrays -------------------------------
la $t0, NUM_ARRAY # set the address of the 1st array
la $t1, FLAG_ARRAY # set the address of the 2nd array
loop1: sw $s4, ($t0) # load a number
sw $s5, ($t1) # load the initial property (1 - a prime)
addi $t2, $t2, 1 # increase the loop counter by one
beq $t2, $s0, EXIT1 # if all the array elements are set up
addi $s4, $s4, 1 # increase the number by one
addu $t0, $t0, 4 # increase the pointer by four bytes
addu $t1, $t1, 4 # increase the pointer by four bytes
j loop1 # repeat to "loop1"
EXIT1: li $s2, 2
li $s6, 2
jal Eratosthenes # start recursive Eratosthenes
li $v0, 4 # system call #4
la $a0, NEWLINE
syscall
li $v0, 4 # system call #4
la $a0, NEWLINE
syscall
li $t2, 0 # reset the loop counter
la $t0, NUM_ARRAY # reset the address of the 1st array
la $t1, FLAG_ARRAY # reset the address of the 2nd array
loop3: lw $a0, ($t1) # load the number there
beq $a0, $zero, SKIP1 # if the target is '0': skip
beq $t2, $zero, SKIP1 # if repeated enough: skip
li $v0, 1 # system call #1
lw $a0, ($t0) # load the number there
syscall
li $v0, 4 # system call #4
la $a0, NEWLINE
syscall
SKIP1: addi $t2, $t2, 1 # increase the loop counter
addu $t0, $t0, 4 # increase the pointer by four bytes
addu $t1, $t1, 4 # increase the pointer by four bytes
blt $t2, $s0, loop3
li $v0, 4 # system call #4
la $a0, END_MSG
syscall
# restore registers ---------------------------------------
lw $ra, ($sp)
lw $s0, 4($sp)
lw $s1, 8($sp)
lw $s2, 12($sp)
lw $s4, 16($sp)
lw $s5, 20($sp)
lw $t0, 24($sp)
lw $t1, 28($sp)
lw $t2, 32($sp)
lw $v0, 36($sp)
lw $a0, 40($sp)
addu $sp, $sp, 48 # delete the stack frame
jr $31 # park it at the parking spot
# THE END OF MODULE MAIN ##########################################
Eratosthenes:
subu $sp,$sp,36
sw $ra, 0($sp)
sw $t5, 4($sp)
sw $t6, 8($sp)
sw $t0, 12($sp)
sw $t1, 16($sp)
sw $t2, 20($sp)
sw $s4, 24($sp)
sw $s5, 28($sp)
sw $s0, 32($sp)
li $s5, 0 #change s5 to 0
li $s6, 2 #reset the x
li $t2, 0
la $t0, NUM_ARRAY #reset Array 1
la $t1, FLAG_ARRAY #reset Array 2
R_Loop:
mult $s2,$s6
mflo $t7
addi $t2,$t2,1
lw $s4, ($t0)
beq $t7, $s4, SKIPone
beq $t2, $s0, EXITL #branch if counter is max
addu $t0, $t0, 4 #next spot in NUM_ARRAY
addu $t1, $t1, 4 #next spot in FLAG_ARRAY
li $v0,1
move $a0, $t7
syscall
li $v0,4
la $a0, NEWLINE
syscall
li $v0,4
la $a0, NEWLINE
syscall
j R_Loop
SKIPone:
addi $s6,$s6,1 #increment x by one
sw $zero, ($t1) #attempt at making position at array 0
#have also tried
#sw $s5, ($t1) #where s5 is initialized at 0
#please take note that offset is 0, because it needs to be
#at the current position at the array
li $v0,4
la $a0, NEWLINE
syscall
li $v0,4
la $a0, NEWLINE
syscall
li $v0,1
move $a0, $t4 #debug aid
syscall
li $v0,4
la $a0, NEWLINE
syscall
li $v0,4
la $a0, NEWLINE
syscall
beq $t2 $s0, EXITL
li $v0, 4
la $a0, INX #debug aid
syscall
j R_Loop
EXITL:
li $t8,10
li $v0, 4
la $a0, INK #debug aid
syscall
beq $s2,$t8, EXITR
addi $s2,$s2,1 #increment k by one
jal Eratosthenes
li $v0 4
la $a0, BUG1
syscall
EXITR:
lw $ra, 0($sp)
lw $t5, 4($sp)
lw $t6, 8($sp)
lw $t0, 12($sp)
lw $t1, 16($sp)
lw $t2, 20($sp)
lw $s4, 24($sp)
lw $s5, 28($sp)
lw $s0, 32($sp)
addu $sp,$sp,36
jr $ra
Any help is appreciated, nothing else seems to work and my teacher is of no help.