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 A237877 Numbers n such that n | A067439(n). 0
 1, 2, 9, 11, 17, 48, 57, 427, 533, 1661, 2161, 4441, 5428, 41628, 171441, 411735, 555716, 1278525, 4292829, 5174373, 8758407, 680133057 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(19) > 3000000. - Giovanni Resta, Feb 17 2014 a(23) > 4 * 10^9. - Hiroaki Yamanouchi, Sep 27 2015 LINKS EXAMPLE 48 is coprime to 1, 5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 35, 37, 41, 43, 47. When 48 is divided by these numbers the remainders are 0, 3, 6, 4, 9, 14, 10, 2, 23, 19, 17, 13, 11, 7, 5, 1. Their sum is 144 and 144 / 48 = 3. MAPLE with(numtheory); P:=proc(q) local i, n, t; for n from 1 to q do t:=0; for i from 2 to n-1 do if gcd(i, n)=1 then t:=t+(n mod i); fi; od; if type(t/n, integer) then print(n); fi; od; end: P(10^6); PROG (PARI) is(n)=sum(i=1, n-1, if(gcd(n, i)==1, n%i))%n==0 \\ Charles R Greathouse IV, Nov 06 2014 CROSSREFS Cf. A067439. Sequence in context: A138759 A345925 A098934 * A043307 A049343 A131140 Adjacent sequences:  A237874 A237875 A237876 * A237878 A237879 A237880 KEYWORD nonn,more AUTHOR Paolo P. Lava, Feb 14 2014 EXTENSIONS a(14) from Michel Marcus, Feb 17 2014 a(15)-a(18) from Giovanni Resta, Feb 17 2014 a(19)-a(22) from Hiroaki Yamanouchi, Sep 27 2015 STATUS approved

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Last modified December 8 01:25 EST 2021. Contains 349590 sequences. (Running on oeis4.)