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Search: id:A119289
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| A119289 |
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Prime numbers p such that there is no prime between 10*p and 10*p+9 inclusive. |
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+0
2
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| 53, 89, 107, 113, 167, 179, 251, 317, 347, 389, 397, 419, 431, 443, 457, 461, 521, 599, 641, 643, 653, 709, 727, 761, 773, 797, 839, 863, 887, 907, 911, 977, 991, 1087, 1091, 1103, 1153, 1187, 1213, 1217, 1229, 1231, 1259, 1277, 1283, 1301, 1307, 1319, 1327
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Prime numbers p with property that appending any single decimal digit to p does not produce a prime. Prime members of A032352.
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MAPLE
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a:=proc(n) if isprime(n) = true and isprime(10*n+1)=false and isprime(10*n+3)=false and isprime(10*n+5)=false and isprime(10*n+7)=false and isprime(10*n+9)=false then n else fi end: seq(a(n), n=1..1500); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 24 2006
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MATHEMATICA
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Select[Prime[Range[1000]], PrimePi[10# + 9] - PrimePi[10# ] == 0 &] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Jul 24 2006
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CROSSREFS
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Sequence in context: A001836 A144939 A118149 this_sequence A124282 A137869 A096697
Adjacent sequences: A119286 A119287 A119288 this_sequence A119290 A119291 A119292
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KEYWORD
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base,nonn
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AUTHOR
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Tanya Khovanova (tanyakh(AT)yahoo.com), Jul 23 2006
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EXTENSIONS
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More terms sent by several contributors, Jul 23 2006
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