A357020 a(n) is the start of the first run of exactly n consecutive numbers not of the form x^2 + x*y + y^2.
2, 5, 22, 32, 68, 85, 230, 260, 352, 1901, 950, 1912, 1430, 1502, 3442, 10733, 4310, 5890, 23933, 15101, 29548, 101534, 18698, 89245, 38858, 46774, 110440, 173213, 118772, 513598, 705437, 273485, 226324, 269813, 726929, 1448005, 1053830, 413974, 1329178, 1626548, 648542
Offset: 1
Keywords
Examples
n a(n) Terms of A034020
1 2 {2}, 5, 6, ...
2 5 2, {5, 6}, 8, 10, ...
3 22 ..., 20, {22, 23, 24}, 26, 29, ...
4 32 ..., 30, {32, 33, 34, 35}, 38, ...
5 68 ..., 66, {68, 69, 70, 71, 72}, 74, ...
6 85 ..., 83, {85, 86, 87, 88, 89, 90}, 92, ...
7 230 ..., 227, {230, ..., 236}, 238, ...
8 260 ..., 258, {260, ..., 267}, 269, ...
9 352 ..., 350, {352, ..., 360}, 362, ...
10 1901 ..., 1898, {1901, ..., 1910}, 1912, ...
11 950 ..., 947, {950, ..., 960}, 962, ...
Links
- Hugo Pfoertner, Table of n, a(n) for n = 1..141