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A130739
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Sum of primes < 2^n.
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6
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0, 5, 17, 41, 160, 501, 1720, 6081, 22548, 80189, 289176, 1070091, 3908641, 14584641, 54056763, 202288087, 761593692, 2867816043, 10862883985, 41162256126, 156592635694, 596946687124, 2280311678414, 8729068693022
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history;
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internal format)
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OFFSET
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1,2
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LINKS
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Kim Walisch, Table of n, a(n) for n = 1..80 (terms n=1..42 from Cino Hilliard)
Kim Walisch, primesum program.
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FORMULA
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a(n) = Sum_{i=2..2^n-1} A061397(i).
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EXAMPLE
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a(3) is 17 because the sum of primes less than 2^3 is 2+3+5+7=17.
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MATHEMATICA
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Table[Sum[Prime[i], {i, PrimePi[2^n-1]}], {n, 1, 10}]
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PROG
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(PARI) a(n) = {s = 0; forprime(p=2, 2^n-1, s +=p); return (s); } \\ Michel Marcus, Jul 17 2013
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CROSSREFS
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Cf. A046731, A099824.
Sequence in context: A246636 A146794 A146834 * A147412 A273116 A273945
Adjacent sequences: A130736 A130737 A130738 * A130740 A130741 A130742
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KEYWORD
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nonn
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AUTHOR
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Graeme McRae, Jul 06 2007
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STATUS
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approved
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