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Search: id:A006919
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| A006919 |
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Write down all the prime divisors in previous term!.
(Formerly M4581)
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+0
4
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| 8, 222, 2337, 31941, 33371313, 311123771, 7149317941, 22931219729, 112084656339, 3347911118189, 11613496501723, 97130517917327, 531832651281459, 3331113965338635107, 3331113965338635107
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
H. Jaleebi, personal communication.
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LINKS
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P. De Geest, Home Primes
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MATHEMATICA
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g[ n_ ] := (x = n; d = {}; While[ FactorInteger[ x ] != {}, f = FactorInteger[ x, FactorComplete -> True ][ [ 1, 1 ] ]; x = x/f; AppendTo[ d, IntegerDigits[ f ] ] ]; FromDigits[ Flatten[ d ] ]); NestList[ g, 8, 15 ]
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CROSSREFS
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Cf. A056938, A037271-A037276, A048985, A048986, A049065.
Sequence in context: A000442 A115964 A055350 this_sequence A013377 A033508 A111836
Adjacent sequences: A006916 A006917 A006918 this_sequence A006920 A006921 A006922
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KEYWORD
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nonn,base,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 05 2000, who remarks that sequence stabilizes at 13th term with a prime.
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