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8, 44, 710, 222821, 24666982037, 304224505147060828973, 46276274758482720007096830321604756046489, 1070746802761292462947634762387664148872052610197552503724569802262354342880260375
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OFFSET
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0,1
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COMMENTS
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Partial sums of iterated triangular numbers with seed a(0)=8. None of the values shown are prime, but there is no a priori obstruction to a prime value.
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LINKS
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FORMULA
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EXAMPLE
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a(6) = 8 + 36 + 666 + 222111 + 24666759216 = 24666982037.
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MAPLE
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A050536 := proc(n) if n = 0 then 8; else binomial( procname(n-1)+1, 2) ; end if; end proc: A174643 := proc(n) add(A050536(i), i=0..n) ; end proc: seq(A174643(n), n=0..10) ; # R. J. Mathar, Apr 15 2010
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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