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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.

A048543 a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 7's.

Table of values

n a(n)
1 8
2 108
3 878
4 870
5 8813
6 27924
7 84129
8 882483
9 2788865
10 7601169
11 88190572
12 421518419
13 4204014483
14 26034169427
15 42305694389
16 88022598108
17 546605779129
18 2788866736108
19 69048807207508
20 98844816642745
21 88187696578
22 2516
23 5270458024477168
24 26772616052167516
25 166654612230648203
26 521323093463907254

List of values

[8, 108, 878, 870, 8813, 27924, 84129, 882483, 2788865, 7601169, 88190572, 421518419, 4204014483, 26034169427, 42305694389, 88022598108, 546605779129, 2788866736108, 69048807207508, 98844816642745, 88187696578, 2516, 5270458024477168, 26772616052167516, 166654612230648203, 521323093463907254]

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

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