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Search: id:A129697
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| A129697 |
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Sum of isolated primes < 10^n. |
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+0
1
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| 2, 577, 51896, 4009989, 345281974, 30126035380, 2657646397769, 238004015750349, 21505022353019864, 1960179022139638131, 180020101551309284879, 16639947666244921992434
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Also A046731(n) - A118552(n) + 5. This agrees with the program in the link up to n = 12.
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LINKS
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C. Hilliard, Sum Isolated Primes.
C. Hilliard, Gcc code.
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FORMULA
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Isolated primes are primes that are not twin prime components.
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EXAMPLE
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The sum of the isolated primes < 100 = 2+23+37+47+53+67+79+83+89+97 = 577, the
second entry in the table.
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PROGRAM
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(PARI) isoprimes(n) = { local(j, s, x); for(j=1, n, s=0; forprime(x=2, 10^j, if(!isprime(x-2)&&!isprime(x+2), s+=x) ); print1(s", ") ) }
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CROSSREFS
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Cf. A007510, A046731, A118552.
Sequence in context: A163277 A003830 A134371 this_sequence A121850 A100011 A134796
Adjacent sequences: A129694 A129695 A129696 this_sequence A129698 A129699 A129700
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KEYWORD
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nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)hotmail.com), Jun 08 2007
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