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Search: id:A138062
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| A138062 |
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Prime number n, lesser of twin primes, isolated from neighboring primes by +- 6 (or more). |
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+0
1
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| 419, 521, 809, 1049, 1151, 1721, 1931, 1949, 2027, 2111, 2309, 2591, 2729, 2999, 3119, 3359, 3371, 3389, 3557
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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419,421 = twin primes -- isolation +- 6 (or more)
419-2 = 417 (3*139) 421+2 = 423 (3*3*47)
419-4 = 415 (5*83) 421+4 = 425 (5*5*17)
419-6 = 413 (7*59) 421+6 = 427 (7*61)
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MATHEMATICA
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q=6; s=""; For[i=1, i<10^2*5, n=Prime[i]; m=n+2; If[PrimeQ[m], a=0; For[j=2, j<=q, If[PrimeQ[n-j]||PrimeQ[m+j], a=1; Break[]]; j=j+2]; If[a==0, s=s<>ToString[n]<>", "]]; i++ ]; Print[s]
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CROSSREFS
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Sequence in context: A096032 A166057 A056068 this_sequence A097233 A142281 A142733
Adjacent sequences: A138059 A138060 A138061 this_sequence A138063 A138064 A138065
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), May 02 2008
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