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Search: id:A104294
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| A104294 |
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p[(p[n]+1)/2], p[n] is n-th prime. |
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+0
3
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| 3, 5, 7, 13, 17, 23, 29, 37, 47, 53, 67, 73, 79, 89, 103, 113, 127, 139, 151, 157, 173, 181, 197, 227, 233, 239, 251, 257, 269, 311, 317, 347, 349, 379, 383, 401, 421, 433, 449, 463, 467, 503, 509, 523, 541, 577, 613, 619, 631
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OFFSET
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2,1
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COMMENT
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n=1 is a degenerate case because p[1]=2, (p[n]+1)/2=3/2, and there is no p[3/2]. p[(p[n]-1)/2] A104293, A104294(n)-A104293(n)=A104295(n)
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FORMULA
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A104294(n)= A104293(n+1)
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EXAMPLE
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a(5)=13 because p((p(5)+1)/2)=p((11+1)/2)=p(6)=13, a(7)=23 because p((p(7)+1)/2)=p((17+1)/2)=p(9)=23.
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MATHEMATICA
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Table[Prime[(Prime[n]+1)/2], {n, 2, 50}]
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CROSSREFS
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Cf. A104293, A104294.
Sequence in context: A032397 A028879 A067567 this_sequence A137270 A071111 A038929
Adjacent sequences: A104291 A104292 A104293 this_sequence A104295 A104296 A104297
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KEYWORD
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easy,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Feb 28 2005
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