login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A243897 as a simple table

na(n)
13
25
311
413
523
643
7131
8311
9353
10401
11491
12761
131051
141063
151091
161151
171201
181433
191523
201531
211723
221733
231811
241831
251951
261973
272053
282081
292221
302333
312543
322591
332621
342663
352953
362963
373191
383433
393571
403623
413643
423821
433911
444051
454273
464391
474973
485273
495393
505591
516101
526131
536173
546203
556263
566473

[3,5,11,13,23,43,131,311,353,401,491,761,1051,
 1063,1091,1151,1201,1433,1523,1531,1723,1733,1811,
 1831,1951,1973,2053,2081,2221,2333,2543,2591,2621,
 2663,2953,2963,3191,3433,3571,3623,3643,3821,3911,
 4051,4273,4391,4973,5273,5393,5591,6101,6131,6173,
 6203,6263,6473]