A034055 Numbers with multiplicative digital root value 8.

8, 18, 24, 29, 36, 38, 42, 46, 49, 63, 64, 66, 67, 76, 77, 79, 81, 83, 88, 92, 94, 97, 99, 118, 124, 129, 136, 138, 142, 146, 149, 163, 164, 166, 167, 176, 177, 179, 181, 183, 188, 192, 194, 197, 199, 214, 219, 222, 226, 229, 233, 234, 236, 237, 241, 243, 248

Offset: 1

Author

Patrick De Geest, Sep 15 1998

Keywords

• nonn
• base
• easy

Links

• Eric Weisstein's World of Mathematics, Multiplicative Digital Root
• Index entries for 10-automatic sequences.

Crossrefs

Cf. A031347.

Cf. A034048, A002275, A034049, A034050, A034051, A034052, A034053, A034054, A034055, A034056 (numbers having multiplicative digital roots 0-9).

Programs

Mathematica

dr8Q[n_]:=NestWhile[Times@@IntegerDigits[#]&,n,#>9&]==8; Select[ Range[ 250],dr8Q] (* Harvey P. Dale, Jun 10 2011 *)