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A336719 as a simple table

na(n)
23
37
47
531
631
7127
8127
9127
10127
11127
12127
138191
148191
158191
168191
17131071
18131071
19524287
20524287
21524287
22524287
23524287
24524287
25524287
26524287
27524287
28524287
29524287
30524287
312147483647
322147483647
332147483647
342147483647
352147483647
362147483647

[3,7,7,31,31,127,127,127,127,127,127,8191,8191,
 8191,8191,131071,131071,524287,524287,524287,
 524287,524287,524287,524287,524287,524287,524287,
 524287,524287,2147483647,2147483647,2147483647,
 2147483647,2147483647,2147483647]