id:A128233 - OEIS Search Results

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Average of p(n) and p(p(n)), where p(k) is the k-th prime.

+0
2

4, 8, 12, 21, 27, 38, 43, 53, 69, 79, 97, 110, 117, 129, 147, 168, 172, 199, 212, 220, 240, 257, 275, 303, 324, 333, 347, 354, 365, 418, 435, 455, 468, 504, 514, 538, 565, 579, 602, 621, 634, 672, 682, 699, 708, 754, 816, 830, 838, 852, 869, 882, 924, 939, 966 (list; graph; listen)

	OFFSET	`2,1`
	EXAMPLE	`a(4)=12 because p(4)=7 and p(7)=17.`
	MAPLE	`a:=n->(ithprime(n)+ithprime(ithprime(n)))/2: seq(a(n), n=2..70);`
	CROSSREFS	`Cf. A128234.` `Sequence in context: A090658 A122108 A123723 this_sequence A092108 A015781 A130643` `Adjacent sequences: A128230 A128231 A128232 this_sequence A128234 A128235 A128236`
	KEYWORD	`nonn`
	AUTHOR	`Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 20 2007`

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

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