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A334688 Numbers missing from Pascal's spiral A334742. 2
9, 11, 13, 15, 16, 18, 19, 21, 22, 24, 25, 26, 28, 29, 30, 31, 33, 34, 35, 36, 38, 39, 40, 41, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 63, 64, 65, 66, 67, 68, 70, 71, 72, 73, 74, 75, 76, 78, 79, 80 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

V:= Array(-10..10, -10..10): t:=1:

i:= 1: j:= 0: V[0, 0]:= 1: R:= NULL:

do

  u:= V[i-1, j]+V[i+1, j]+V[i, j-1]+V[i, j+1];

  V[i, j]:= u;

  R:= R, $(t+1)..(u-1);

  t:= u;

  if u > 100 then break fi;

  if  j > -i and j < i then j:= j+1

  elif i > -j and i <= j then i:= i-1

  elif i < j and j <= -i then j:= j-1

  else i:= i+1

  fi;

od:

R; # Robert Israel, May 15 2020

CROSSREFS

Cf. A334742.

Sequence in context: A158607 A070699 A065454 * A248629 A008558 A335912

Adjacent sequences:  A334685 A334686 A334687 * A334689 A334690 A334691

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 10 2020

STATUS

approved

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Last modified November 26 12:37 EST 2020. Contains 338639 sequences. (Running on oeis4.)