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A083197 Triangular array, read by rows, where if n is odd the n-th row consists of n least unused nonprimes, while if n is even the n-th row consists of the n least unused primes. 0
1, 2, 3, 4, 6, 8, 5, 7, 11, 13, 9, 10, 12, 14, 15, 17, 19, 23, 29, 31, 37, 16, 18, 20, 21, 22, 24, 25, 41, 43, 47, 53, 59, 61, 67, 71, 26, 27, 28, 30, 32, 33, 34, 35, 36, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 127, 131, 137 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This sequence is a permutation of the natural numbers.

LINKS

Table of n, a(n) for n=1..69.

EXAMPLE

Triangle begins:

1

2 3

4 6 8

5 7 11 13

9 10 12 14 15

17 19 23 29 31 37

...

CROSSREFS

Sequence in context: A120817 A166310 A109852 * A235262 A245704 A260425

Adjacent sequences:  A083194 A083195 A083196 * A083198 A083199 A083200

KEYWORD

nonn,tabl

AUTHOR

Amarnath Murthy, Apr 27 2003

EXTENSIONS

Edited, corrected and extended by Ray Chandler, Jan 05 2009

STATUS

approved

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Last modified September 25 21:33 EDT 2017. Contains 292500 sequences.