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Search: id:A093744
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| A093744 |
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Number of prime pairs below 10^n having a difference of 18. |
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+0
3
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OFFSET
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1,4
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FORMULA
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Count prime pairs below 10^n having a difference of 18
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EXAMPLE
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a(4)=40 because there are 40 prime gaps of 18 below 10^4
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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 A093743 A093745.
Sequence in context: A115189 A140045 A069079 this_sequence A109105 A107419 A159946
Adjacent sequences: A093741 A093742 A093743 this_sequence A093745 A093746 A093747
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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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