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Smallest triangular number which is one more than the product of n distinct numbers > 1.
1

%I #6 Dec 05 2013 19:56:03

%S 3,15,55,253,1081,13861,115921,665281,18280081,75479041,2080995841,

%T 68302634401,924972048001,48318396825601,495843855091201,

%U 31747936252032001,791764338474869761

%N Smallest triangular number which is one more than the product of n distinct numbers > 1.

%C a(18) > 2^63. [From _Donovan Johnson_, May 30 2010]

%e a(3) = 2*3*9 + 1 = 55. a(4) = 2*3*6*7 + 1 = 253.

%Y Cf. A081950.

%K nonn

%O 1,1

%A _Amarnath Murthy_, Apr 02 2003

%E More terms from _Diana L. Mecum_, Jul 09 2007

%E a(13)-a(17) from _Donovan Johnson_, May 30 2010