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 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(n) = prime(n) + 1 if n is prime. LINKS FORMULA a(n) = Sum_{k=1..n} A158906(n,k). a(n) = A032741(n) + n. - R. J. Mathar, Jan 08 2015 a(n) = Sum_{i=1..n} floor(n/i)-floor((n-1)/(i+1)). - Wesley Ivan Hurt, Sep 13 2017 EXAMPLE a(n) = 6 = (4 + 1 + 0 + 1). MAPLE A158906 := proc(n, k)     add( A158821(n-1, j-1)*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: A284061 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

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Last modified February 19 10:24 EST 2019. Contains 320310 sequences. (Running on oeis4.)