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A061907 The iterative cycle: n -> sum of digits of n^2 has only four distinct elements. 1
2, 11, 20, 101, 110, 134, 136, 163, 172, 197, 200, 217, 233, 242, 244, 262, 278, 287, 296, 298, 307, 313, 314, 316, 343, 359, 386, 397, 406, 413, 422, 424, 431, 433, 442, 458, 467, 469, 476, 478, 487, 514, 523, 541, 577, 583, 586, 593, 604, 613, 614, 622 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..52.

EXAMPLE

a(2) = 4 since 2 -> 4 -> 1+6 = 7 -> 4+9 = 13 -> 1+6+9 = 16 -> 2+5+6 = 13, thus {4,7,13,16} are the distinct elements of the iterative cycle of 2.

CROSSREFS

Cf. A007953, A004159, A061903 - A061910.

Sequence in context: A146087 A064975 A115095 * A052216 A094629 A081242

Adjacent sequences:  A061904 A061905 A061906 * A061908 A061909 A061910

KEYWORD

nonn,base

AUTHOR

Asher Auel (asher.auel(AT)reed.edu), May 17 2001

STATUS

approved

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Last modified February 22 01:04 EST 2019. Contains 320381 sequences. (Running on oeis4.)