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A081951
Smallest triangular number which is one more than the product of n distinct numbers > 1.
1
3, 15, 55, 253, 1081, 13861, 115921, 665281, 18280081, 75479041, 2080995841, 68302634401, 924972048001, 48318396825601, 495843855091201, 31747936252032001, 791764338474869761
OFFSET
1,1
COMMENTS
a(18) > 2^63. [From Donovan Johnson, May 30 2010]
EXAMPLE
a(3) = 2*3*9 + 1 = 55. a(4) = 2*3*6*7 + 1 = 253.
CROSSREFS
Cf. A081950.
Sequence in context: A015249 A084152 A084175 * A367520 A346542 A033853
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Apr 02 2003
EXTENSIONS
More terms from Diana L. Mecum, Jul 09 2007
a(13)-a(17) from Donovan Johnson, May 30 2010
STATUS
approved