id:A074745 - OEIS Search Results

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Sum of products of pairs of successive primes.

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6, 21, 56, 133, 276, 497, 820, 1257, 1924, 2823, 3970, 5487, 7250, 9271, 11762, 14889, 18488, 22575, 27332, 32515, 38282, 44839, 52226, 60859, 70656, 81059, 92080, 103743, 116060, 130411, 147048, 164995, 184038, 204749, 227248, 250955 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) = Sum_{k=1..n} ithprime(k)*ithprime(k+1) = Sum_{k=1..n} A006094(k).`
	MAPLE	`with(numtheory): a := proc(n) local k: RETURN(add(ithprime(k)*ithprime(k+1), k=1..n)):end;`
	CROSSREFS	`Sequence in context: A100356 A137361 A058484 this_sequence A056414 A056341 A053809` `Adjacent sequences: A074742 A074743 A074744 this_sequence A074746 A074747 A074748`
	KEYWORD	`nonn`
	AUTHOR	`Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Sep 06 2002`

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

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