0,1

If z=A051451(n), then {z-1, z+1} are twin primes.

(419+421)/2=420=LCM[1,2,3,4,5,6,7] No more such primes occurs below m<2000. Known values of m such that LCM[1,..,m] is a twin prime mean value are as follows: {3,4,5,6,7,19,20,21,22,47,48}.

Cf. A003418, A051451, A049536, A057706.

Sequence in context: A104357 A104364 A057824 this_sequence A095150 A041697 A121170

Adjacent sequences: A057819 A057820 A057821 this_sequence A057823 A057824 A057825

nonn

Labos E. (labos(AT)ana.sote.hu), Nov 08 2000