A334688 - OEIS

A334688

Numbers missing from Pascal's spiral A334742.

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:

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