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A237589
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Sum of first n odd noncomposite numbers.
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3
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1, 4, 9, 16, 27, 40, 57, 76, 99, 128, 159, 196, 237, 280, 327, 380, 439, 500, 567, 638, 711, 790, 873, 962, 1059, 1160, 1263, 1370, 1479, 1592, 1719, 1850, 1987, 2126, 2275, 2426, 2583, 2746, 2913, 3086, 3265, 3446, 3637, 3830, 4027, 4226, 4437, 4660, 4887
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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EXAMPLE
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For n = 5 the first five odd noncomposite numbers are 1, 3, 5, 7, 11, so a(5) = 1 + 3 + 5 + 7 + 11 = 27.
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MAPLE
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a := proc(n) option remember; `if`(n=1, 1, a(n-1) + ithprime(n)) end:
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MATHEMATICA
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a[1]=1; a[n_]:=a[n]=a[n-1]+Prime[n]; Table[a[n], {n, 1, 49}] (* Robert P. P. McKone, Jan 18 2022 *)
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PROG
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(PARI) terms(n) = my(s=1, i=0); forprime(p=3, , if(i >= n, break, print1(s, ", "); i++; s=s+p))
/* Print initial 50 terms as follows */
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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