id:A082500 - OEIS Search Results

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a(n) = if n is odd then ceil(n/2) else prime(n/2).

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1, 2, 2, 3, 3, 5, 4, 7, 5, 11, 6, 13, 7, 17, 8, 19, 9, 23, 10, 29, 11, 31, 12, 37, 13, 41, 14, 43, 15, 47, 16, 53, 17, 59, 18, 61, 19, 67, 20, 71, 21, 73, 22, 79, 23, 83, 24, 89, 25, 97, 26, 101, 27, 103, 28, 107, 29, 109, 30, 113, 31, 127, 32, 131, 33, 137, 34, 139, 35, 149, 36 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Alternatively, list of pairs n, prime(n). - Zak Seidov (zakseidov(AT)yahoo.com), Feb 18 2005` `a(n) = (n mod 2)(n+1)/2 + (1 - n mod 2)A000040(n/2);` `k>0: a(2k-1)=k, a(2k)=A000040(k), A049084(a(2k))=k; a(2k-1)+a(2*k)=A014688(k).`
	CROSSREFS	`Sequence in context: A007150 A122352 A114092 this_sequence A059292 A115000 A036825` `Adjacent sequences: A082497 A082498 A082499 this_sequence A082501 A082502 A082503`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), May 11 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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