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A061806 Numbers n such that the iterative cycle: n -> sum of digits of n^2 has only three distinct elements. 0
4, 5, 17, 26, 28, 32, 37, 40, 43, 44, 49, 50, 53, 62, 63, 64, 67, 73, 74, 76, 77, 82, 83, 86, 87, 88, 89, 91, 92, 93, 94, 97, 98, 107, 109, 113, 114, 116, 117, 118, 122, 124, 125, 126, 127, 128, 133, 137, 141, 143, 149, 154, 157, 158, 161, 164, 166, 167, 169, 170 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..60.

EXAMPLE

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

CROSSREFS

Cf. A007953, A004159, A061903 - A061910.

Sequence in context: A152021 A026678 A026869 * A306161 A119997 A010361

Adjacent sequences:  A061803 A061804 A061805 * A061807 A061808 A061809

KEYWORD

nonn,base

AUTHOR

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

STATUS

approved

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Last modified December 3 10:17 EST 2021. Contains 349462 sequences. (Running on oeis4.)