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A193996 Numbers that require exactly 8 iterations to determine that they are happy or not (A007770 and A031177). 1
4, 16, 20, 37, 42, 58, 89, 145, 78999, 79899, 79989, 79998, 87999, 89799, 89979, 89997, 97899, 97989, 97998, 98799, 98979, 98997, 99789, 99798, 99879, 99897, 99978, 99987, 378999, 379899, 379989, 379998, 387999, 389799, 389979, 389997, 389999, 397899, 397989 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
This sequence begins with the last 8 numbers of A039943. The number 78999 is the first happy number here.
LINKS
MATHEMATICA
f[n_] := Total[IntegerDigits[n]^2]; Select[Range[400000], Length[NestWhileList[f, #, UnsameQ, All]] - 1 == 8 &]
CROSSREFS
Sequence in context: A326781 A326788 A039943 * A232400 A345763 A354712
KEYWORD
nonn,base
AUTHOR
T. D. Noe, Aug 23 2011
STATUS
approved

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Last modified June 23 20:17 EDT 2024. Contains 373653 sequences. (Running on oeis4.)