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A077156 a(0) = 1, followed by next n primes followed by next n composite numbers. 2
1, 2, 4, 3, 5, 6, 8, 7, 11, 13, 9, 10, 12, 17, 19, 23, 29, 14, 15, 16, 18, 31, 37, 41, 43, 47, 20, 21, 22, 24, 25, 53, 59, 61, 67, 71, 73, 26, 27, 28, 30, 32, 33 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

A permutation of the natural numbers.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

MATHEMATICA

Module[{nn=10, prs, cmps, len}, prs=Prime[Range[(nn(nn+1))/2]]; cmps= Select[ Range[ Max[ prs]], CompositeQ]; Join[{1}, Riffle[ TakeList[prs, Range[nn]], TakeList[ cmps, Range[ nn]]]]]// Flatten (* Harvey P. Dale, Apr 29 2022 *)

CROSSREFS

Cf. A077157.

Sequence in context: A095689 A083194 A105366 * A258076 A244724 A132948

Adjacent sequences: A077153 A077154 A077155 * A077157 A077158 A077159

KEYWORD

easy,nonn

AUTHOR

Amarnath Murthy, Oct 31 2002

STATUS

approved

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Last modified January 29 02:42 EST 2023. Contains 359915 sequences. (Running on oeis4.)