login
A130758
a(n) = n if n is not an odd prime number. Otherwise, a(n) = k, where k is the smallest integer such that n < 10^k.
2
0, 1, 2, 1, 4, 1, 6, 1, 8, 9, 10, 2, 12, 2, 14, 15, 16, 2, 18, 2, 20, 21, 22, 2, 24, 25, 26, 27, 28, 2, 30, 2, 32, 33, 34, 35, 36, 2, 38, 39, 40, 2, 42, 2, 44, 45, 46, 2, 48, 49, 50, 51, 52, 2, 54, 55, 56, 57, 58, 2, 60, 2, 62, 63, 64, 65, 66, 2, 68
OFFSET
1,3
MATHEMATICA
Table[If[OddQ[n]&&PrimeQ[n], IntegerLength[n], n], {n, 0, 70}] (* Harvey P. Dale, Apr 13 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Mohammad K. Azarian, Aug 17 2007
EXTENSIONS
Offset corrected by Mohammad K. Azarian, Nov 19 2008
STATUS
approved