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Search: id:A093737
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| A093737 |
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Number of prime pairs below 10^n having a difference of 4. |
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+0
2
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OFFSET
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1,2
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FORMULA
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Count prime pairs below 10^n having a difference of 4
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EXAMPLE
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a(2)=7 because there are 7 prime gaps of 4 below 10^2
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PROGRAM
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UBASIC: 20 N=1:dim T(34); 30 A=nxtprm(N); 40 N=A; 50 B=nxtprm(N); 60 D=B-A; 70 for x=2 to 34 step 2; 80 if D=X and B<10^2+1 then T(X)=T(X)+1; 90 next X; 100 if B>10^2+1 then 140; 110 B=A; 120 N=N+1; 130 goto 30; 140 for x=2 to 34 step 2; 150 print T(X); , 160 next (This program simultaneously finds values from 2 to 34 -- if gap=2 add 1-- adjust lines 80 and 100 for desired 10^n)
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CROSSREFS
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Cf. A007508 A093738.
Sequence in context: A164083 A096200 A055282 this_sequence A081039 A083327 A026716
Adjacent sequences: A093734 A093735 A093736 this_sequence A093738 A093739 A093740
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KEYWORD
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easy,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Apr 15 2004
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