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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 A347190 A263016 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 December 9 23:05 EST 2022. Contains 358710 sequences. (Running on oeis4.)