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 A200145 Primitive (squarefree) elements of A199745. 1
 2145, 2730, 4641, 4845, 5005, 5610, 7410, 8778, 9177, 11305, 11730, 13485, 13585, 17017, 20010, 20930, 21489, 21505, 23529, 26445, 29946, 31465, 31857, 32538, 33649, 34410, 35409, 35581, 36685, 38570, 38874, 41106, 42441, 43401, 45066, 46189, 46345, 47730, 49569 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE Filter:= proc(n) local F;   F:= ifactors(n)[2];   if max(seq(f[2], f=F)) > 1 or nops(F) < 4 then return false fi;   F:= map(t -> t[1], F);   convert(F, `+`) = 2*(max(F)+min(F)); end proc: select(Filter, [\$1..10^5]); # Robert Israel, Dec 31 2015 MATHEMATICA Select[Range[50000], Max@@Last/@(fi=FactorInteger[#])==1&&Plus@@(pl=First/@fi)/2==pl[[1]]+pl[[-1]]&] (*Ray Chandler, Nov 14 2011*) CROSSREFS Intersection of A199745 and A005117. Sequence in context: A252547 A211601 A199745 * A179271 A118576 A259413 Adjacent sequences:  A200142 A200143 A200144 * A200146 A200147 A200148 KEYWORD nonn AUTHOR Ray Chandler, Nov 14 2011 STATUS approved

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Last modified June 29 18:25 EDT 2022. Contains 354913 sequences. (Running on oeis4.)