login
A092817
First component of triples a,b,c such that a < b < c, (a*b) mod (a+b) = c, (b*c) mod (b+c) = a, (c*a) mod (c+a) = b. The triples are ordered according to sum of first and second component.
4
5, 69, 87, 125, 335, 315, 184, 391, 425, 324, 384, 207, 612, 455, 589, 747, 725, 494, 675, 671, 847, 851, 749, 663, 783, 679, 931, 707, 1029, 736, 575, 1184, 1139, 1088, 1035, 1247, 1127, 720, 763, 896, 999, 1400, 1391, 1445, 901, 1288, 1661, 1395, 1175
OFFSET
1,1
COMMENTS
A092818 gives second component, A092819 gives third component.
EXAMPLE
The sixth triple is 315, 525, 735, hence a(6) = 315.
PROG
(PARI) {m=4000; for(n=3, m, for(a=1, (n-1)\2, b=n-a; c=a*b%(a+b); if(b<c, if((b*c)%(b+c)==a, if((a*c)%(a+c)==b, print1(a, ", ")))))); }
CROSSREFS
KEYWORD
nonn
AUTHOR
Klaus Brockhaus, Mar 06 2004
STATUS
approved