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Search: id:A072999
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| A072999 |
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a(n+1) is the smallest prime>a(n) such that a(n+1) == a(n-1) (mod a(n)). |
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+0
6
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| 2, 3, 5, 13, 31, 137, 853, 6961, 28697, 179143, 6836131, 68540453, 966402473, 15530980021, 94152282599, 203835545219, 2540178825227, 61168127350667, 6119352913891927, 220357873027460039, 16312601956945934813
(list; graph; listen)
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OFFSET
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0,1
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..100
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EXAMPLE
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After 3,5, one can't have composite 8, so keep adding 5 until you reach 13. After 5,13, one can't have composite 18, so keep adding 13 until you reach 31.
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PROGRAM
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(PARI) l=2; h=3; print1("2, 3, "); while(l<2^128, t=l+h; while(!isprime(t), t+=h); print1(t, ", "); l=h; h=t)
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CROSSREFS
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Cf. A073680
Sequence in context: A108515 A041519 A060434 this_sequence A141179 A079147 A057999
Adjacent sequences: A072996 A072997 A072998 this_sequence A073000 A073001 A073002
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KEYWORD
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nonn
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AUTHOR
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Phil Carmody (pc+oeis(AT)asdf.org), Aug 15 2002
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