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Search: id:A079637
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| A079637 |
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Smallest prime p with audioactive "echo" of at least n, that is, the finite sequence p_0 = p, p_1 = LookAndSay(p_0),...,p_n = LookAndSay(p_(n-1)) consists entirely of primes. |
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1
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OFFSET
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0,1
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COMMENT
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1. LookAndSay(n) denotes the description of the digits of n. For example, LookAndSay(111223) = 312213. 2. There is no prime < 10^5 with echo = 6.
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EXAMPLE
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233 is the smallest prime p such that p_0 = 233, p_1 = LookAndSay(233) = 1223, p_2 = LookAndSay(1223) = 112213
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CROSSREFS
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Cf. A005150.
Sequence in context: A053942 A053954 A063869 this_sequence A062662 A084727 A093440
Adjacent sequences: A079634 A079635 A079636 this_sequence A079638 A079639 A079640
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KEYWORD
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base,more,nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 30 2003
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EXTENSIONS
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Corrected by Mark Hudson (mrmarkhudson(AT)hotmail.com), Feb 02 2003, who reports there are no more terms < 10^6
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