cp's OEIS Frontend

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.

A261080 Semiprimes p*q for which p and q are successive primes and their binary representations differ from each other in one bit position only.

Table of values

n a(n)
1 6
2 35
3 323
4 437
5 899
6 1763
7 2021
8 4757
9 9797
10 10403
11 19043
12 22499
13 27221
14 38021
15 39203
16 72899
17 79523
18 95477
19 99221
20 131753
21 145157
22 154433
23 164009
24 205193
25 210677
26 213443
27 250997
28 272483
29 324899
30 381923
31 412163
32 416021
33 455621
34 549077
35 557993
36 594437
37 656099
38 675683
39 736163
40 741317
41 777923
42 783221
43 826277
44 870473
45 881717
46 974153
47 1022117
48 1102499
49 1127843
50 1238753

List of values

[6, 35, 323, 437, 899, 1763, 2021, 4757, 9797, 10403, 19043, 22499, 27221, 38021, 39203, 72899, 79523, 95477, 99221, 131753, 145157, 154433, 164009, 205193, 210677, 213443, 250997, 272483, 324899, 381923, 412163, 416021, 455621, 549077, 557993, 594437, 656099, 675683, 736163, 741317, 777923, 783221, 826277, 870473, 881717, 974153, 1022117, 1102499, 1127843, 1238753]

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

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