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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.

A264777 a(n) is least number > 0 such that the concatenation of a(1) ... a(n) is a heptagonal number (A000566).

Table of values

n a(n)
1 1
2 8
3 9
4 5296
5 9701946
6 3254409476919
7 214948107829163565920446430
8 31021083401526077498957998513210666182754941982955902
9 81969637737594122848099953820072074027662186843090573669278105078583525219219292274950391247747733666835448

List of values

[1, 8, 9, 5296, 9701946, 3254409476919, 214948107829163565920446430, 31021083401526077498957998513210666182754941982955902, 81969637737594122848099953820072074027662186843090573669278105078583525219219292274950391247747733666835448]

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

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