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A122065
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Take sum of squares of digits of previous term; start with 74169.
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14
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74169, 183, 74, 65, 61, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4
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listen;
history;
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OFFSET
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1,1
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COMMENTS
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From a quiz, cf. Russel & Carter reference.
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REFERENCES
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K. Russell and P. Carter, Number Puzzles, W. Foulsham and Co. Ltd. (1993).
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LINKS
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FORMULA
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MATHEMATICA
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PROG
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(Magma) [74169, 183, 74, 65, 61] cat &cat[[37, 58, 89, 145, 42, 20, 4, 16]: n in [0..17]]; // Vincenzo Librandi, Jan 29 2013
(PARI) A122065_vec=vector(50, n, t=if(n>1, norml2(digits(t)), 74169));
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CROSSREFS
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Cf. A000216 (main entry for related sequences), A003132 (the iterated "sum digits squared" map).
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KEYWORD
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nonn,base,easy
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AUTHOR
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Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 14 2006
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STATUS
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approved
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