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A163522
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a(n) = sum of digits of a(n-1)^2.
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0
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2, 4, 7, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16, 13, 16
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| 7 is in the sequence because 4^2=16 and 6+1=7; 7^2=49 and 4+9=13. Other examples: 1) 3,9,9,9,9,9; 2) 5,7,13,16,13; 3) 8,10,1,1.
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CROSSREFS
| Sequence in context: A177101 A018414 A002152 * A002466 A162842 A164901
Adjacent sequences: A163519 A163520 A163521 * A163523 A163524 A163525
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KEYWORD
| nonn,base
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AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jul 30 2009
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EXTENSIONS
| Edited by N. J. A. Sloane, Aug 01 2009
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