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A008460
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Take sum of squares of digits of previous term.
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13
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6, 36, 45, 41, 17, 50, 25, 29, 85, 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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| R. Honsberger, Ingenuity in Math., Random House, 1970, p. 83.
A. Porges, A set of eight numbers, Amer. Math. Monthly, 52 (1945), 379-382.
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FORMULA
| Periodic with period 8.
a(13+n)=A080709(n) [From M. F. Hasler (www.univ-ag.fr/~mhasler), May 24 2009]
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PROG
| (PARI) A008460(n)=[6, 36, 45, 41, 17, 50, 25, 29, 85, 89, 145, 42, 20, 4, 16, 37, 58][if(n<18, n, (n-10)%8+10)] \\\\ [From M. F. Hasler (www.univ-ag.fr/~mhasler), May 24 2009]
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CROSSREFS
| Cf. A003132 (the iterated map), A003621, A039943, A099645, A031176, A007770, A000216 (starting with 2), A000218 (starting with 3), A080709 (starting with 4), A000221 (starting with 5), A008462 (starting with 8), A008463 (starting with 9), A139566 (starting with 15), A122065 (starting with 74169). [From M. F. Hasler (www.univ-ag.fr/~mhasler), May 24 2009]
Sequence in context: A070401 A070400 A043063 * A106128 A132633 A047792
Adjacent sequences: A008457 A008458 A008459 * A008461 A008462 A008463
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KEYWORD
| nonn,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Deleted an erroneous (duplicate) term. M. F. Hasler (www.univ-ag.fr/~mhasler), May 24 2009
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