|
| |
|
|
A074369
|
|
Number of divisors of Sum_{i=1,...,n} prime(i).
|
|
0
| |
|
|
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; refs; listen; history; internal format)
|
|
|
|
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 * A073348 A122457 A139770
Adjacent sequences: A074366 A074367 A074368 * A074370 A074371 A074372
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Sep 24 2002
|
| |
|
|
