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A068571 Number of happy numbers <=10^n. 2
1, 3, 20, 143, 1442, 14377, 143071, 1418854, 14255667, 145674808, 1492609148, 15091199357, 149121303586, 1443278000870, 13770853279685, 130660965862333, 1245219117260664, 12024696404768025, 118226055080025491, 1183229962059381238, 12005034444292997294 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

LINKS

L. Klasen, Table of n, a(n) for n = 0..122

L. Klasen, Xeen3d's happy.html

W. Schneider, Happy Numbers

Eric Weisstein's World of Mathematics, Happy Number

CROSSREFS

Cf. A007770.

Sequence in context: A082143 A009156 A074573 * A074569 A026303 A154627

Adjacent sequences:  A068568 A068569 A068570 * A068572 A068573 A068574

KEYWORD

nonn,base

AUTHOR

Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 26 2002

EXTENSIONS

More terms from Lambert Klasen (Lambert.Klasen(AT)gmx.de), Nov 03 2004

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Last modified February 16 10:07 EST 2012. Contains 205904 sequences.