The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A245469 Numbers x such that sigma(x)=sigma(V(x)), where sigma(x) is the sum of the divisors of x and V(x) the transform defined in A245252. 1
 432, 537, 3954, 4641, 5394, 7487, 7889, 12640, 20999, 23099, 25990, 35960, 38320, 39479, 41569, 44628, 54880, 58302, 65569, 67172, 73321, 85277, 92939, 106750, 118240, 131652, 153912, 192632, 245019, 258852, 273819, 278389, 303769, 324269, 388494, 393269, 395454 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE V(3954) = 7249 and sigma(3954) = sigma(7249) = 7920. MAPLE with(numtheory): V:=proc(t) local j, w, x, y; x:=t; y:=[]; while x>0 do y:=[x mod 10, op(y)]; x:=trunc(x/10); od; x:=(y[nops(y)]+y[1]) mod 10; for j from 1 to nops(y)-1 do x:=x*10+((y[j]+y[j+1]) mod 10); od; x; end: P:=proc(q) local n; for n from 10 to q do if sigma(n)=sigma(V(n)) then print(n); fi; od; end: P(10^10); CROSSREFS Cf. A000203, A243993, A245252, A245468. Sequence in context: A175026 A205192 A066419 * A069781 A337670 A231231 Adjacent sequences:  A245466 A245467 A245468 * A245470 A245471 A245472 KEYWORD nonn,base AUTHOR Paolo P. Lava, Jul 23 2014 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 19 22:12 EST 2022. Contains 350466 sequences. (Running on oeis4.)