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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A064507 Numbers of more than one digit that yield primes when cast in their own base.

Table of values

n a(n)
1 21
2 27
3 29
4 61
5 67
6 111
7 151
8 191
9 201
10 203
11 223
12 241
13 313
14 319
15 331
16 351
17 373
18 397
19 403
20 409
21 461
22 463
23 481
24 553
25 559
26 571
27 667
28 711
29 791
30 807
31 841
32 869
33 889
34 931
35 979
36 1071
37 1079
38 1107
39 1129
40 1189
41 1257
42 1273
43 1277
44 1297
45 1431
46 1437
47 1583
48 1611
49 1639

List of values

[21, 27, 29, 61, 67, 111, 151, 191, 201, 203, 223, 241, 313, 319, 331, 351, 373, 397, 403, 409, 461, 463, 481, 553, 559, 571, 667, 711, 791, 807, 841, 869, 889, 931, 979, 1071, 1079, 1107, 1129, 1189, 1257, 1273, 1277, 1297, 1431, 1437, 1583, 1611, 1639]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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