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 A214177 Sum of the 4 nearest neighbors of n in a spiral with positive integers. 6
 20, 24, 32, 24, 44, 32, 56, 40, 44, 72, 52, 56, 88, 64, 68, 72, 108, 80, 84, 88, 128, 96, 100, 104, 108, 152, 116, 120, 124, 128, 176, 136, 140, 144, 148, 152, 204, 160, 164, 168, 172, 176, 232, 184, 188, 192, 196, 200, 204, 264, 212, 216, 220, 224, 228, 232, 296 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Nearby numbers on diagonals are not counted as neighbors for this sequence. LINKS Rémy Sigrist, Table of n, a(n) for n = 1..5202 Rémy Sigrist, PARI program for A214177 EXAMPLE Spiral begins: .   49  26--27--28--29--30--31    |   |                   |   48  25  10--11--12--13  32    |   |   |           |   |   47  24   9   2---3  14  33    |   |   |   |   |   |   |   46  23   8   1   4  15  34    |   |   |       |   |   |   45  22   7---6---5  16  35    |   |               |   |   44  21--20--19--18--17  36    |                       |   43--42--41--40--39--38--37 . The four nearest neighbors of 2 are 1, 3, 9, 11. Their sum is a(2) = 24. PROG (PARI) See Links section. CROSSREFS Cf. A137928, A137930, A137931, A002061, A114254. Cf. A214176 (sum of the 8 nearest neighbors). Sequence in context: A109131 A171696 A060461 * A044996 A263016 A107302 Adjacent sequences:  A214174 A214175 A214176 * A214178 A214179 A214180 KEYWORD nonn,easy AUTHOR Alex Ratushnyak, Jul 06 2012 STATUS approved

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Last modified July 24 11:17 EDT 2021. Contains 346273 sequences. (Running on oeis4.)