1,1
Eric Weisstein's World of Mathematics, Triangular Number
Cf. A036523.
Adjacent sequences: A048358 A048359 A048360 this_sequence A048362 A048363 A048364
Sequence in context: A068644 A119054 A119090 this_sequence A119161 A119211 A119235
nonn,base,more
Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 15 1999.
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