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A258621
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Decimal expansion of sum(1/A030450).
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1
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2, 2, 5, 6, 9, 4, 7, 4, 5, 8, 5, 2, 6, 5, 9, 7, 9, 5, 5, 4, 6, 2, 7, 3, 6, 7, 2, 4, 4, 4, 2, 3, 4, 2, 2, 1, 0, 5, 5, 9, 2, 3, 6, 5, 0, 8, 8, 9, 3, 6, 9, 5, 9, 5, 3, 3, 4, 6, 0, 0, 4, 9, 6, 0, 9, 2, 6, 7, 5, 4, 9, 2, 8, 1, 7, 5, 2, 2, 0, 0, 6, 7, 7, 6, 1, 4, 8, 9, 6, 2, 1, 3, 3, 1, 7, 7, 7, 7, 7, 7, 2, 8, 5, 6, 4, 6
(list;
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graph;
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listen;
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internal format)
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OFFSET
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1,1
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LINKS
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EXAMPLE
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2.2569474585265979554627367244423422105592365088936959533....
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PROG
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(Sage)
return prod((n-i+1)^(2^i) for i in (1..n))
N(sum(1/A030450(n) for n in (0..9)), digits=106)
(C)
#include <stdio.h>
#include <mpfr.h>
#define dBIT 512
#define dLIST n, t, u
int main (void) {
mpfr_t dLIST;
mpfr_rnd_t trnd;
unsigned int i;
trnd = MPFR_RNDU;
mpfr_inits2 (dBIT, dLIST, (mpfr_ptr) 0);
mpfr_set_d (n, 1.0, trnd);
mpfr_set_d (t, 1.0, trnd);
for (i = 1; i <= 9; i++) {
mpfr_mul_ui (t, t, i, trnd);
mpfr_mul (t, t, t, trnd);
mpfr_set_d (u, 1.0, trnd);
mpfr_div (u, u, t, trnd);
mpfr_add (n, n, u, trnd);
}
mpfr_printf ("%.106Rg", n);
mpfr_clears (dLIST, (mpfr_ptr) 0);
return 0;
}
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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