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What is the 1000th member of this sequence?

Name: Anonymous 2009-05-25 5:11

10,26,44,64,84,106,129,152,175,200

Name: Anonymous 2009-06-09 16:31

a_1000 = 1,015,010

here's a closed form

a_k = 10 + 14k + k(k+1)

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