

A158907


Row sums of triangle A158906.


2



1, 3, 4, 6, 6, 9, 8, 11, 11, 13, 12, 17, 14, 17, 18, 20, 18, 23, 20, 25, 24, 25, 24, 31, 27, 29, 30, 33, 30, 37, 32, 37, 36, 37, 38, 44, 38, 41, 42, 47, 42, 49, 44, 49, 50, 49, 48, 57, 51, 55, 54, 57, 54, 61, 58, 63, 60, 61, 60
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OFFSET

1,2


COMMENTS

a(n) = prime(n) + 1 if n is prime.


LINKS

Table of n, a(n) for n=1..59.


FORMULA

a(n) = sum_{k=1..n} A158906(n,k).
a(n) = A032741(n)+n.  R. J. Mathar, Jan 08 2015


EXAMPLE

a(n) = 6 = (4 + 1 + 0 + 1).


MAPLE

A158906 := proc(n, k)
add( A158821(n1, j1)*A051731(j, k), j=k..n) ;
end proc:
A158907 := proc(n)
add(A158906(n, k), k=1..n) ;
end proc:
seq(A158907(n), n=1..62) ; # R. J. Mathar, Jan 08 2015


CROSSREFS

Cf. A158906.
Sequence in context: A230300 A162625 A033095 * A175708 A023830 A063649
Adjacent sequences: A158904 A158905 A158906 * A158908 A158909 A158910


KEYWORD

nonn,easy


AUTHOR

Gary W. Adamson and Mats Granvik, Mar 29 2009


STATUS

approved



