A166695 - OEIS

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A166695

Alternating smallest odd/even number not in list followed by that number of consecutive odd/even numbers, sequence commencing with 1.

1, 3, 2, 4, 6, 5, 7, 9, 11, 13, 15, 8, 10, 12, 14, 16, 18, 20, 22, 24, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 53, 55, 57, 59, 61, 63, 65

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

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

MAPLE

R:= NULL: x:= -1: y:= 0: count:= 0: m:= 1:

while count < 100 do

if m = 1 then

R:= R, x+2, seq(x+2*(i+1), i=1..(x+2));

count:= count + x+3;

x:= R[-1]

else

R:= R, y+2, seq(y+2*(i+1), i=1..(y+2));

count:=count + y+3;

y:= R[-1];

fi;

m:= 1-m;

od:

R; # Robert Israel, May 16 2024

CROSSREFS

Sequence in context: A186005 A080782 A116941 * A254107 A116942 A374610

Adjacent sequences: A166692 A166693 A166694 * A166696 A166697 A166698

KEYWORD

nonn,look

AUTHOR

Gerald Hillier, Oct 18 2009

STATUS

approved