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A131425
Row sums of triangle A131424.
2
1, 5, 16, 33, 68, 101, 156, 205, 280, 389, 468, 605, 732, 841, 988, 1181, 1392, 1545, 1784, 1999, 2182, 2463, 2714, 3027, 3410, 3709, 3964, 4283, 4554, 4893, 5564, 5947, 6410, 6751, 7386, 7755, 8282, 8827, 9310, 9887, 10482, 10923, 11722, 12191, 12758, 13243
OFFSET
1,2
LINKS
FORMULA
a(n) = n*(prime(n) - 3) + Sum_{k=1..n} prime(k). - Andrew Howroyd, Aug 28 2018
EXAMPLE
a(4) = 33 = sum of row 4 terms of triangle A131424: (6 + 7 + 9 + 11).
PROG
(PARI) a(n)={n*(prime(n) - 3) + sum(k=1, n, prime(k))} \\ Andrew Howroyd, Aug 28 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Jul 10 2007
EXTENSIONS
Terms a(10) and beyond from Andrew Howroyd, Aug 28 2018
STATUS
approved