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A046861 as a simple table

na(n)
11
27
311
431
541
649
7109
8127
9139
10143
11151
12173
13179
14203
15217
16397
17491
18511
19521
20539
21547
22589
23599
24683
25749
26803
27929
28989
292041
302047
312107
322153
332191
342219
352531
362693
372723
382761
392999
403661
413721
423739
436199
446923
457949

[1,7,11,31,41,49,109,127,139,143,151,173,179,203,
 217,397,491,511,521,539,547,589,599,683,749,803,
 929,989,2041,2047,2107,2153,2191,2219,2531,2693,
 2723,2761,2999,3661,3721,3739,6199,6923,7949]