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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.

A048537 a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 4's.

Table of values

n a(n)
1 6
2 66
3 215
4 681
5 6681
6 12018
7 201115
8 1531159
9 6541784
10 21058215
11 156340764
12 675098840
13 5868938806
14 6666461193
15 120186956049
16 586862372693
17 1115546688777
18 4176295540840
19 66589372231193
20 66634408865198
21 210842150539318
22 2108185118566309
23 21011769217380159
24 185591342591574215
25 67412496945629038

List of values

[6, 66, 215, 681, 6681, 12018, 201115, 1531159, 6541784, 21058215, 156340764, 675098840, 5868938806, 6666461193, 120186956049, 586862372693, 1115546688777, 4176295540840, 66589372231193, 66634408865198, 210842150539318, 2108185118566309, 21011769217380159, 185591342591574215, 67412496945629038]

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

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