A134817 - OEIS

A134817

a(1)=1; a(n)=a(n-1)*(number of decimal digits of a(n-1))+1.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 21, 43, 87, 175, 526, 1579, 6317, 25269, 126346, 758077, 4548463, 31839242, 254713937, 2292425434, 22924254341, 252166797752, 3026001573025, 39338020449326, 550732286290565, 8260984294358476

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..30.

FORMULA

a(n) = a(n-1)*floor(log(a(n-1)) + 1) + 1.

MATHEMATICA

a = {1}; Do[AppendTo[a, a[[ -1]]*Length[IntegerDigits[a[[ -1]]]] + 1], {40}]; a (* Stefan Steinerberger, Jan 30 2008 *)

CROSSREFS

Sequence in context: A138142 A085890 A274842 * A067581 A099469 A358097

Adjacent sequences: A134814 A134815 A134816 * A134818 A134819 A134820

KEYWORD

nonn,base

AUTHOR

Rolf Pleisch, Jan 28 2008

EXTENSIONS

More terms from Stefan Steinerberger, Jan 30 2008

STATUS

approved