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Search: id:A089786
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| A089786 |
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Primes of the form prime(2k) followed by prime(k). |
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+0
2
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| 73, 197, 7129, 10141, 15161, 19379, 271109, 373157, 593251, 757331, 983431, 997433, 1069463, 1231547, 1361599, 1531661, 1571683, 1627727, 1831811, 2069911, 2161967, 2213977, 24731093, 25311103, 26931193, 27131213, 27911237, 28191259
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OFFSET
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1,1
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EXAMPLE
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10141 is a term as a concatenation of prime(26)=101 followed by prime(13)=41.
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MAPLE
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a:=proc(k) local s, m: s:= [op(convert(ithprime(k), base, 10)), op(convert(ithprime(2*k), base, 10))]: m:=add(s[j]*10^(j-1), j=1..nops(s)): if not isprime(m) then RETURN(NULL) else RETURN(m) fi: end; seq(a(k), k=1..250); (C. Ronaldo)
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CROSSREFS
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Cf. A089782, A089783, A089784, A089785, A089787.
Sequence in context: A088199 A140010 A122723 this_sequence A142894 A141909 A142517
Adjacent sequences: A089783 A089784 A089785 this_sequence A089787 A089788 A089789
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 24 2003
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EXTENSIONS
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Corrected and extended by C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 25 2004
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