A105803 Self-describing sequence: 4 composite numbers, then 6 prime numbers, then 8 composites, then 9 primes, then 11 composites, etc.

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

Links

Table of n, a(n) for n=4..41.

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

Adjacent sequences: A105800 A105801 A105802 * A105804 A105805 A105806

Keyword

base,easy,nonn

Author

Eric Angelini, May 05 2005

Status

approved