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Search: id:A125902
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| A125902 |
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a(n) = sum of the first n primes which are coprime to n. |
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+0
2
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| 2, 8, 14, 26, 36, 72, 70, 98, 126, 190, 186, 276, 268, 372, 432, 438, 484, 634, 620, 784, 864, 950, 940, 1156, 1156, 1356, 1368, 1584, 1564, 1978, 1820, 1986, 2262, 2408, 2572, 2742, 2710, 3066, 3250, 3440, 3406, 4016, 3788, 4214, 4430, 4636, 4614, 5112
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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The first 6 primes which are coprime to 6 are 5,7,11,13,17,19. So a(6)=5+7+11+13+17+19 = 72.
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MATHEMATICA
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f[n_] := Block[{c = n, k = 0, p, s = 0}, While[c > 0, k++; While[p = Prime[k]; GCD[p, n] > 1, k++ ]; c--; s += p; ]; s]; Table[f[n], {n, 50}] (*Chandler*)
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CROSSREFS
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Cf. A119993, A125903.
Sequence in context: A121055 A107072 A120413 this_sequence A056677 A053697 A092346
Adjacent sequences: A125899 A125900 A125901 this_sequence A125903 A125904 A125905
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Dec 13 2006
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 14 2006
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