id:A026238 - OEIS Search Results

Search: id:A026238

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a(n) = j if n is the j-th prime, else a(n) = k if n is the k-th composite.

+0
4

1, 2, 1, 3, 2, 4, 3, 4, 5, 5, 6, 6, 7, 8, 9, 7, 10, 8, 11, 12, 13, 9, 14, 15, 16, 17, 18, 10, 19, 11, 20, 21, 22, 23, 24, 12, 25, 26, 27, 13, 28, 14, 29, 30, 31, 15, 32, 33, 34, 35, 36, 16, 37, 38, 39, 40, 41, 17, 42, 18, 43, 44, 45, 46, 47, 19 (list; graph; listen)

	OFFSET	`2,2`
	CROSSREFS	`a(n) = A049084(n) + A066246(n).` `Adjacent sequences: A026235 A026236 A026237 this_sequence A026239 A026240 A026241` `Sequence in context: A052306 A046823 A124876 this_sequence A066136 A097140 A028242`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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