A067205 - OEIS

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A067205

Least numbers with n = digital root = number of prime factors.

0

19, 38, 12, 40, 32, 96, 448, 1664, 1152

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

For 1 <= n <= 9: A010888(a(n)) = A001222(a(n)) = n.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

a(7)=448 as A001222(448)=7 because of 448=2*2*2*2*2*2*7

and A010888(448)=7 because of 4+4+8=16 and 1+6=7.

CROSSREFS

Sequence in context: A144594 A287310 A123028 * A196185 A040342 A164009

Adjacent sequences: A067202 A067203 A067204 * A067206 A067207 A067208

KEYWORD

nonn,base,fini,full

AUTHOR

Reinhard Zumkeller, Feb 19 2002

STATUS

approved