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 A259365 Numbers n such that phi(Rev(n)) - phi(n) = n. 0
 28, 139872, 2764928, 34141176, 329774256 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(6) > 3*10^10. - Giovanni Resta, Jun 26 2015 LINKS FORMULA Solutions of the equation A000010( A004086(n) ) - A000010(n) = n. EXAMPLE phi(82) - phi(28) = 40 - 12 = 28; phi(278931) - phi(139872) = 184032 - 44160 = 139872; etc. MAPLE with(numtheory): T:=proc(w) local x, y, z; x:=w; y:=0; for z from 1 to ilog10(x)+1 do y:=10*y+(x mod 10); x:=trunc(x/10); od; y; end: P:=proc(q) local a, j, k, n; for n from 1 to q do if phi(T(n))-phi(n)=n then print(n); fi; od; end: P(10^9); CROSSREFS Cf. A000010, A004086, A097647. Sequence in context: A159443 A119162 A180067 * A047680 A090768 A119180 Adjacent sequences:  A259362 A259363 A259364 * A259366 A259367 A259368 KEYWORD nonn,more,base AUTHOR Paolo P. Lava, Jun 25 2015 STATUS approved

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Last modified April 1 10:33 EDT 2020. Contains 333159 sequences. (Running on oeis4.)