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A077157 a(0) = 1, followed by next n composite numbers followed by next n primes. 1
1, 4, 2, 6, 8, 3, 5, 9, 10, 12, 7, 11, 13, 14, 15, 16, 18, 17, 19, 23, 29, 20, 21, 22, 24, 25, 31, 37, 41, 43, 47, 26, 27, 28, 30, 32, 33, 53, 59, 61, 67, 71, 73, 34, 35, 36, 38, 39, 40, 42 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

A permutation of the natural numbers.

LINKS

Table of n, a(n) for n=0..49.

CROSSREFS

Cf. A077156.

Sequence in context: A083412 A086399 A105365 * A268718 A306874 A114478

Adjacent sequences:  A077154 A077155 A077156 * A077158 A077159 A077160

KEYWORD

easy,nonn

AUTHOR

Amarnath Murthy, Oct 31 2002

STATUS

approved

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Last modified October 29 21:18 EDT 2020. Contains 338074 sequences. (Running on oeis4.)