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Search: id:A104293
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| A104293 |
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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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| 2, 3, 5, 11, 13, 19, 23, 31, 43, 47, 61, 71, 73, 83, 101, 109, 113, 137, 149, 151, 167, 179, 193, 223, 229, 233, 241, 251, 263, 307, 313, 337, 347, 373, 379, 397, 419, 431, 443, 461, 463, 499, 503, 521, 523, 571, 607, 617, 619
(list; graph; listen)
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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=1/2 and there is no p[1/2]. p[(p[n]+1)/2] A104294, A104294(n)-A104293(n)=A104295(n)
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EXAMPLE
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a(5)=11 because p((p(5)-1)/2)=p((11-1)/2)=p(5)=11, a(7)=19 because p((p(7)-1)/2)=p((17-1)/2)=p(8)=19.
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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. A104294, A104295.
Sequence in context: A139053 A153135 A038615 this_sequence A153002 A042999 A089194
Adjacent sequences: A104290 A104291 A104292 this_sequence A104294 A104295 A104296
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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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