From the list of numbers that are recommended from this thread from number patterns...primes, triangles, etc. in the first column.. vs numbers not part of a pattern.. 48 vs 21...
69 70
66 67
65 64
62 63
61 60
59 56
58 54
57 52
55 50
53 48
51 44
49 42
47 40
46 32
45 30
43 27
41 24
39 20
38 18
37 16
36 12
35
34
33
31
29
28
26
25
23
22
21
19
17
15
14
13
11
10
9
8
7
6
5
4
3
2
1
69 70
66 67
65 64
62 63
61 60
59 56
58 54
57 52
55 50
53 48
51 44
49 42
47 40
46 32
45 30
43 27
41 24
39 20
38 18
37 16
36 12
35
34
33
31
29
28
26
25
23
22
21
19
17
15
14
13
11
10
9
8
7
6
5
4
3
2
1