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Search: id:A123137
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| A123137 |
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a(n) = a(n-1)^2 + Sum of the digits of a(n-1), with a(1)=1. |
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+0
1
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| 1, 2, 6, 42, 1770, 3132915, 9815156397249, 96337295102457969494768070, 9280874427658072275134580545332124401295103091525032, 86134630141957550628261532252390058231417831318795074704890644033088478051503964\ 693639295413423482601219
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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A. Frank & P. Jacqueroux, International Contest, 2001. Item 28
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EXAMPLE
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a(5) = 42^2 + (4 + 2) = 1770
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PROGRAM
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(PARI) a=1; for(n=1, 11, print1(a, ", "); sda=eval(Vec(Str(a))); a=a^2+sum(i=1, length(sda), sda[i]))
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CROSSREFS
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Sequence in context: A061062 A152479 A115961 this_sequence A014117 A054377 A007018
Adjacent sequences: A123134 A123135 A123136 this_sequence A123138 A123139 A123140
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KEYWORD
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nonn,base
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AUTHOR
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Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 30 2006
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