The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A008460 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A008460

Take sum of squares of digits of previous term; start with 6.
(history; published version)

#31 by Charles R Greathouse IV at Fri Oct 21 22:07:45 EDT 2022

STATUS

editing

approved

#30 by Charles R Greathouse IV at Fri Oct 21 22:07:44 EDT 2022

KEYWORD

nonn,base,easy

STATUS

approved

editing

#29 by Charles R Greathouse IV at Thu Sep 08 08:44:35 EDT 2022

PROG

(MAGMAMagma) [6, 36, 45, 41, 17, 50, 25, 29, 85] cat &cat[[89, 145, 42, 20, 4, 16, 37, 58]: n in [0..17]]; // Vincenzo Librandi, Jan 29 2013

Discussion

Thu Sep 08

08:44

OEIS Server: https://oeis.org/edit/global/2944

#28 by Joerg Arndt at Sat Apr 28 03:20:24 EDT 2018

STATUS

reviewed

approved

#27 by Michel Marcus at Sat Apr 28 02:59:32 EDT 2018

STATUS

proposed

reviewed

#26 by M. F. Hasler at Fri Apr 27 16:37:35 EDT 2018

STATUS

editing

proposed

#25 by M. F. Hasler at Fri Apr 27 16:37:16 EDT 2018

NAME

Take sum of squares of digits of previous term; start with 6.

REFERENCES

R. Honsberger, Ingenuity in Math., Mathematics, Random House, 1970, p. 83.

FORMULA

a(13+n) = A080709(n). [_- _M. F. Hasler_, May 24 2009]

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). [_- _M. F. Hasler_, May 24 2009]

STATUS

approved

editing

#24 by Joerg Arndt at Tue Jan 16 02:37:39 EST 2018

STATUS

reviewed

approved

#23 by Michel Marcus at Tue Jan 16 01:11:56 EST 2018

STATUS

proposed

reviewed

#22 by Jon E. Schoenfield at Mon Jan 15 22:53:18 EST 2018

STATUS

editing

proposed