A220100 -id:A220100 - cp's OEIS frontend

A220099 Sum of the eight nearest neighbors of n in a double spiral with positive integers and 1 at the center.

44, 66, 63, 94, 91, 81, 80, 101, 100, 158, 154, 133, 131, 153, 151, 222, 218, 185, 183, 190, 186, 206, 202, 237, 235, 318, 314, 269, 267, 270, 266, 286, 282, 321, 319, 414, 410, 353, 351, 350, 346, 366, 362, 382, 378, 398, 394, 437, 435, 542, 538, 469, 467, 462, 458

Offset: 1

Alex Ratushnyak, Dec 04 2012

Double spiral begins:
.
  82---84---86---88---90---92---94---96---98
   |
  80   51---53---55---57---59---61---63---65
   |    |                                  |
  78   49   26---28---30---32---34---36   67
   |    |    |                        |    |
  76   47   24   11---13---15---17   38   69
   |    |    |    |              |    |    |
  74   45   22    9    2----4   19   40   71
   |    |    |    |    |    |    |    |    |
  72   43   20    7    1    6   21   42   73
   |    |    |    |    |    |    |    |    |
  70   41   18    5----3    8   23   44   75
   |    |    |              |    |    |    |
  68   39   16---14---12---10   25   46   77
   |    |                        |    |    |
  66   37---35---33---31---29---27   48   79
   |                                  |    |
  64---62---60---58---56---54---52---50   81
                                           |
  99---97---95---93---91---89---87---85---83

Cf. A220098, A220100.

cp's OEIS Frontend

A220099 Sum of the eight nearest neighbors of n in a double spiral with positive integers and 1 at the center.

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