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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.

A338784 a(n) is the smallest number with exactly n divisors such that all its divisors end with the same digit (which is necessarily 1).

Table of values

n a(n)
1 1
2 11
3 121
4 341
5 14641
6 3751
7 1771561
8 13981
9 116281
10 453871
11 25937424601
12 153791
13 3138428376721
14 54918391
15 14070001
16 852841
17 45949729863572161
18 4767521
19 5559917313492231481
20 18608711
21 1702470121
22 804060162631
23 81402749386839761113321
24 9381251
25 13521270961
26 97291279678351
27 195468361

List of values

[1, 11, 121, 341, 14641, 3751, 1771561, 13981, 116281, 453871, 25937424601, 153791, 3138428376721, 54918391, 14070001, 852841, 45949729863572161, 4767521, 5559917313492231481, 18608711, 1702470121, 804060162631, 81402749386839761113321, 9381251, 13521270961, 97291279678351, 195468361]

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

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