A105799 - OEIS

A105799

Self-describing sequence: 2 prime numbers, then 3 composites, then 4 primes, then 6 composites, then 8 primes, then 11 composites, then 13 primes, etc.

2, 3, 4, 6, 8, 11, 13, 17, 19, 20, 21, 22, 24, 25, 26, 29, 31, 37, 41, 43, 47, 53, 59, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 150, 152, 153, 154, 155, 156, 158

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

OFFSET

2,1

LINKS

Table of n, a(n) for n=2..64.

EXAMPLE

2 3 4 6 8 11 13 17 19 20 21 22 24 25 26 29 31 37 41 43 47 53 59 ...

^ ^ - - - ^^ ^^ ^^ ^^ -- -- -- -- -- -- ^^ ^^ ^^ ^^ ^^ ^^ ^^ ^^

.2....3........4..............6....................8....

pri..comp....primes.......composites.............primes

CROSSREFS

Sequence in context: A002858 A211522 A368482 * A347462 A340589 A102463

Adjacent sequences: A105796 A105797 A105798 * A105800 A105801 A105802

KEYWORD

base,easy,nonn

AUTHOR

Eric Angelini, May 05 2005

STATUS

approved