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A077131
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Sum of odd-indexed primes.
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7
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2, 7, 18, 35, 58, 89, 130, 177, 236, 303, 376, 459, 556, 659, 768, 895, 1032, 1181, 1338, 1505, 1684, 1875, 2072, 2283, 2510, 2743, 2984, 3241, 3510, 3787, 4070, 4377, 4690, 5021, 5368, 5721, 6088, 6467, 6856, 7257, 7676, 8107, 8546, 8995, 9456, 9923, 10410
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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p_1=2, p_2=3 and p_3=5, therefore a(2) = p_1 + p_3 = 2 + 5 = 7.
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MATHEMATICA
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A077131list[nmax_]:=Accumulate[Prime[Range[1, 2nmax, 2]]]; A077131list[100] (* Paolo Xausa, Aug 28 2023 *)
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PROG
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(PARI) a(n)=if(n<1, 0, sum(k=1, n, prime(2*k-1)))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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