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.

A256356 Composites in base 10 that remain composite in exactly two bases b, 2 <= b <= 10, expansions interpreted as decimal numbers.

Table of values

n a(n)
1 33247243
2 64037779
3 104865433
4 130237003
5 238561081
6 550677781
7 947051353
8 1013991553
9 1246382791
10 1343122201
11 1607697631
12 1609062751
13 1632753601
14 1788658063
15 2203645111
16 2364166213
17 2393866411
18 2480419783
19 2518589671
20 2544177511
21 2668538575
22 3029334883

List of values

[33247243, 64037779, 104865433, 130237003, 238561081, 550677781, 947051353, 1013991553, 1246382791, 1343122201, 1607697631, 1609062751, 1632753601, 1788658063, 2203645111, 2364166213, 2393866411, 2480419783, 2518589671, 2544177511, 2668538575, 3029334883]

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

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