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Search: id:A145986
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| A145986 |
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Ending prime: first occurrence consecutive runs n to n+1 where p/4=1 |
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+0
8
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| 5, 17, 101, 409, 2633, 12437, 77153, 11677, 11689, 373777, 766373, 3358373
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(1)=5 is same as a(1) in A055623 because 5 is a single digit number
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REFERENCES
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Enoch Haga, Exploring Primes on Your PC and the Internet, 1994-2007. Pp. 30-31. ISBN 978-1-885794-24-6
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EXAMPLE
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a(2)=17 because this is the 2nd prime in the first run of 2 primes where p/4=1
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PROGRAM
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(Other) UBASIC: 10 'cluster primes 20 C=1 30 input "end #"; L 40 for N=3 to L step 2 50 S=int(sqrt(N)) 60 for A=3 to S step 2 70 B=N/A 80 if int(B)*A=N then cancel for:goto 170 90 next A 100 C=C+1 110 E=N/4:E=int(E):R=N-(4*E) 120 if R=1 then print N; :C1=C1+1:T1=T1+1:print T1 130 if R=3 then T1=0 140 if R=3 then print " "; N; :C3=C3+1:T2=T2+1:print T2 150 if R=1 then T2=0 160 if T1>10 or T2>10 then stop 170 next 180 print "Total primes="; C; :print "Type A"; C1; "Type B"; C3
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CROSSREFS
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A055623 A054624 A145988 A145989 A145990 A145991 A145992 A145993 A145994
Sequence in context: A139390 A145824 A076516 this_sequence A034821 A158007 A143562
Adjacent sequences: A145983 A145984 A145985 this_sequence A145987 A145988 A145989
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KEYWORD
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easy,more,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Oct 26 2008
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