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 A225069 Least nonagonal (9-gonal) number that is the product of n nonagonal numbers greater than 1. 2
 9, 265926, 9909504, 28123200, 34171875, 9833523682950, 189619679700, 1489258878162739200, 32051313254079000000000, 231538926078057635957250, 5980078350588060426240000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Lars Blomberg, Table of n, a(n) with solutions for n=1..11 EXAMPLE Let non(n) = n*(7n-5)/2. Then a(1) = 9 = non(2). a(2) = 265926 = non(276) = non(4) * non(41). a(3) = 9909504 = non(1683) = non(3) * non(4) * non(51). a(4) = 28123200 = non(2835) = non(3)^2 * non(5) * non(14). a(5) = 34171875 = non(3125) = non(2)^2 * non(5)^3. a(6) = 9833523682950 = non(1676180) = non(2)^3 * non(6) * non(55) * non(58). CROSSREFS Cf. A001106 (9-gonal or nonagonal numbers). Cf. A212616, A212617, A225066-A225070 (3-, 5- to 10-gonal cases). Sequence in context: A300195 A159344 A120352 * A058468 A133414 A013850 Adjacent sequences:  A225066 A225067 A225068 * A225070 A225071 A225072 KEYWORD nonn,more AUTHOR T. D. Noe, May 01 2013 EXTENSIONS Corrected a(4)-a(6) and added a(7)-a(11) by Lars Blomberg, Sep 21 2013 STATUS approved

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Last modified May 28 16:37 EDT 2022. Contains 354119 sequences. (Running on oeis4.)