id:A074369 - OEIS Search Results

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Number of divisors of Sum_{i=1,...,n} prime(i).

+0
1

2, 2, 4, 2, 6, 2, 4, 4, 9, 4, 12, 2, 8, 2, 8, 4, 16, 4, 8, 6, 8, 4, 8, 6, 12, 8, 10, 4, 16, 8, 16, 4, 12, 4, 6, 4, 16, 4, 8, 12, 8, 6, 8, 4, 12, 4, 8, 4, 16, 8, 12, 12, 16, 4, 4, 8, 16, 4, 4, 2, 8, 6, 8, 2, 4, 4, 8, 8, 8, 8, 16, 4, 8, 8, 4, 8, 16, 6, 20, 12, 6, 4, 12, 16, 16, 8, 24, 12, 12, 8, 24 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`The number of divisors of prime(1) + prime(2) + prime(3) = 2 + 3 + 5 = 10 is 4, so a(3) = 4.`
	MATHEMATICA	`s = 0; l = {}; Do[s = s + Prime[i]; l = Append[l, DivisorSigma[0, s]], {i, 1, 100}]; l`
	CROSSREFS	`Sequence in context: A054704 A143525 A082174 this_sequence A073348 A122457 A139770` `Adjacent sequences: A074366 A074367 A074368 this_sequence A074370 A074371 A074372`
	KEYWORD	`easy,nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Sep 24 2002`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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