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Search: id:A024675
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| A024675 |
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Average of two consecutive odd primes. |
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+0
49
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| 4, 6, 9, 12, 15, 18, 21, 26, 30, 34, 39, 42, 45, 50, 56, 60, 64, 69, 72, 76, 81, 86, 93, 99, 102, 105, 108, 111, 120, 129, 134, 138, 144, 150, 154, 160, 165, 170, 176, 180, 186, 192, 195, 198, 205, 217, 225, 228, 231, 236, 240, 246, 254, 260, 266, 270, 274, 279, 282, 288, 300
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Sometimes called interprimes.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..10000
Eric Weisstein's World of Mathematics, Interprime
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MAPLE
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seq( ( (ithprime(x)+ithprime(x+1))/2 ), x=2..40);
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MATHEMATICA
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Plus @@@ Partition[Table[Prime[n], {n, 2, 100}], 2, 1]/2
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PROGRAM
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(PARI) for(X=2, 50, print((prime(X)+prime(X+1))/2)) - Hauke Worpel (thebigh(AT)outgun.com), May 08 2008
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CROSSREFS
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Cf. A072568, A072569. Bisections give A058296, A079424.
Sequence in context: A007074 A054087 A079255 this_sequence A100915 A088765 A078782
Adjacent sequences: A024672 A024673 A024674 this_sequence A024676 A024677 A024678
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KEYWORD
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nonn,nice,easy
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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