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A073870 Smallest composite number not included earlier that is a multiple of n. 2
4, 6, 9, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 15, 32, 34, 36, 38, 40, 21, 44, 46, 48, 25, 52, 27, 56, 58, 30, 62, 64, 33, 68, 35, 72, 74, 76, 39, 80, 82, 42, 86, 88, 45, 92, 94, 96, 49, 50, 51, 104, 106, 54, 55, 112, 57, 116, 118, 60, 122, 124, 63, 128, 65, 66, 134, 136 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
A permutation of the composite numbers.
LINKS
FORMULA
It appears that for n>3, if n is an odd composite number then a(n) = n, otherwise a(n) = 2n.
CROSSREFS
Cf. A073871.
Sequence in context: A343906 A180853 A085088 * A236025 A218036 A236536
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Aug 16 2002
EXTENSIONS
Corrected and extended by Franklin T. Adams-Watters, May 12 2006
Edited by N. J. A. Sloane, May 05 2007
STATUS
approved

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Last modified March 29 06:15 EDT 2024. Contains 371265 sequences. (Running on oeis4.)