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A159305 Sequence of happy tribonacci numbers. 1
1, 7, 13, 44, 98950096, 15832480722303616, 1127444240280152749, 80286250603180403871, 271606440286606849984, 3108406708580377597810, 120346786571258131649185, 1682555786678552786861430747564 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Intersection of A000073 and A007770. - Michel Marcus, Aug 08 2013

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..550

MATHEMATICA

hapQ[n_]:=MemberQ[NestList[Total[IntegerDigits[#]^2]&, n, 15], 1]; Select[ LinearRecurrence[{1, 1, 1}, {1, 1, 2}, 150], hapQ] (* Harvey P. Dale, Jun 05 2011 *)

CROSSREFS

Sequence in context: A272032 A023286 A287685 * A146648 A219501 A267310

Adjacent sequences:  A159302 A159303 A159304 * A159306 A159307 A159308

KEYWORD

nonn,base

AUTHOR

Levrand Roland (roland.levrand(AT)gmx.ch), Apr 09 2009

STATUS

approved

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Last modified January 26 23:05 EST 2020. Contains 331289 sequences. (Running on oeis4.)