A121578 - OEIS

%I #9 Dec 23 2015 22:51:22

%S 0,12,24,36,48,60,72,84,96,108,120,132,1,13,25,37,49,61,73,85,97,109,

%T 121,133,2,14,26,38,50,62,74,86,98,110,122,134,3,15,27,39,51,63,75,87,

%U 99,111,123,135,4,16,28,40,52,64,76,88,100,112,124,136,5,17,29,41,53,65

%N Values m of number pairs (m,n) which yield associated matching times on the clock with interchanged hour and minute hands for corresponding n in A121577.

%C The pair (m,n) is reflexive, i.e., when n=m, m=n.

%C In fact, for n = 12*i + j, with 0 <= i < 12; 0 <= j < 12, m = i + 12*j. - _Lekraj Beedassy_, Aug 09 2006

%D A. P. Domoryad, Mathematical Games and Pastimes, Problem 15 pp. 242;289 Pergamon Press NY 1965.

%D Y. Perelman, Mathematics can be fun, pp. 236-8 Mir Moscow.

%Y Cf. A121577.

%K fini,nonn

%O 1,2

%A _Lekraj Beedassy_, Aug 08 2006