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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.

A177213 Numbers k that are the products of two distinct primes such that 2*k-1, 4*k-3, 8*k-7 and 16*k-15 are also products of two distinct primes.

Table of values

n a(n)
1 247
2 295
3 478
4 634
5 694
6 721
7 1255
8 1267
9 1294
10 1387
11 1546
12 1762
13 1942
14 2323
15 2374
16 2773
17 3005
18 3334
19 3403
20 3883
21 3949
22 4126
23 4714
24 4741
25 4777
26 5062
27 5269
28 5287
29 5353
30 5422
31 5617
32 6583
33 6805
34 7273
35 7495
36 8587
37 8767
38 9017
39 9406
40 9427
41 9847
42 10018

List of values

[247, 295, 478, 634, 694, 721, 1255, 1267, 1294, 1387, 1546, 1762, 1942, 2323, 2374, 2773, 3005, 3334, 3403, 3883, 3949, 4126, 4714, 4741, 4777, 5062, 5269, 5287, 5353, 5422, 5617, 6583, 6805, 7273, 7495, 8587, 8767, 9017, 9406, 9427, 9847, 10018]

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

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