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A105803
Self-describing sequence: 4 composite numbers, then 6 prime numbers, then 8 composites, then 9 primes, then 11 composites, etc.
0
4, 6, 8, 9, 11, 13, 17, 19, 23, 29, 30, 32, 33, 34, 35, 36, 38, 39, 41, 43, 47, 53, 59, 61, 67, 71, 73, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86
OFFSET
4,1
EXAMPLE
4 6 8 9 11 13 17 19 23 29 30 32 33 34 35 36 38 39 ...
^ ^ ^ ^ -- -- -- -- -- -- ^^ ^^ ^^ ^^ ^^ ^^ ^^ ^^
...4............6....................8................................
..comp........primes.............composites
CROSSREFS
Sequence in context: A067611 A366451 A190485 * A202268 A084985 A068631
KEYWORD
base,easy,nonn
AUTHOR
Eric Angelini, May 05 2005
STATUS
approved