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A111688 Primes and composite numbers alternately in increasing order. 0
2, 4, 5, 6, 7, 8, 11, 12, 13, 14, 17, 18, 19, 20, 23, 24, 29, 30, 31, 32, 37, 38, 41, 42, 43, 44, 47, 48, 53, 54, 59, 60, 61, 62, 67, 68, 71, 72, 73, 74, 79, 80, 83, 84, 89, 90, 97, 98, 101, 102, 103, 104, 107, 108, 109, 110 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

3 is the only prime missing. p and p+1 where p is a prime.

LINKS

Table of n, a(n) for n=1..56.

CROSSREFS

Sequence in context: A324583 A101742 A194831 * A058049 A091871 A303393

Adjacent sequences:  A111685 A111686 A111687 * A111689 A111690 A111691

KEYWORD

easy,nonn

AUTHOR

Amarnath Murthy, Aug 17 2005

STATUS

approved

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Last modified March 23 16:52 EDT 2019. Contains 321432 sequences. (Running on oeis4.)