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 A185542 a(n) = m*(m+1)/2, where m = floor(n^(5/2)). 1
 1, 15, 120, 528, 1540, 3916, 8385, 16471, 29646, 50086, 80601, 124251, 185745, 269011, 379756, 524800, 709836, 944625, 1237951, 1599366, 2041210, 2577585, 3216916, 3980431, 4884375, 5939181, 7172578, 8605026, 10253656, 12149985, 14313925, 16776528, 19565640, 22717170, 26263128, 30236976, 34673628 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A subsequence of A000217, the triangular numbers. LINKS G. C. Greubel, Table of n, a(n) for n = 1..5000 FORMULA a(n) = A000217(A155013(n)). - Michel Marcus, Jul 08 2017 MATHEMATICA f[n_] = Floor[n^(5/2)]*Floor[n^(5/2)+1]/2; Table[f[n], {n, 1, 80}] PROG (PARI) for(n=1, 50, print1(floor(n^(5/2))*floor(1 + n^(5/2))/2, ", ")) \\ G. C. Greubel, Jul 07 2017 CROSSREFS Cf. A000217, A155013. Sequence in context: A139615 A196506 A027484 * A226989 A126898 A162635 Adjacent sequences:  A185539 A185540 A185541 * A185543 A185544 A185545 KEYWORD nonn AUTHOR Clark Kimberling, Jan 30 2011 STATUS approved

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Last modified January 18 17:18 EST 2022. Contains 350455 sequences. (Running on oeis4.)