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A117531 Number of primes in the n-th row of the triangle in A117530. 5
1, 2, 3, 3, 5, 3, 7, 3, 5, 6, 6, 6, 13, 3, 11, 8, 12, 8, 13, 10, 8, 7, 12, 10, 9, 21, 6, 22, 11, 7, 13, 12, 21, 13, 14, 16, 18, 7, 20, 17, 21, 20, 24, 14, 18, 20, 16, 16, 35, 10, 18, 29, 18, 30, 30, 26, 21, 18, 21, 29, 16, 22, 32, 40, 10, 27, 24, 25, 45, 18, 39, 40, 43, 11, 11 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
1 <= a(n) <= n; conjecture: a(n) < n for n>13.
LINKS
FORMULA
a(n) = Sum(A010051(A117530(n,k)): 1 <= k <= n).
CROSSREFS
Sequence in context: A111607 A327124 A329277 * A275940 A105555 A066858
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Mar 25 2006
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)