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A077695
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a(n) = triangular number pertaining to the number f(n) obtained by concatenating n n times.
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0
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1, 253, 55611, 9876790, 1543206790, 222222111111, 30246911419753, 3950617249382716, 499999999500000000, 51015202530354045509590858075706560555, 617283950617283950617716049382716049382716
(list; graph; refs; listen; history; internal format)
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