|
| |
|
|
A152275
|
|
Number of 3's among the digits of all n-digit primes.
|
|
9
|
|
|
|
1, 8, 66, 602, 5552, 52541, 505880, 4907822, 47923752, 469985783, 4625005356
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,2
|
|
|
LINKS
|
Table of n, a(n) for n=1..11.
|
|
|
MATHEMATICA
|
Join[{1}, Table[Count[Flatten[IntegerDigits/@Prime[Range[PrimePi[10^(n-1)]+ 1, PrimePi[10^n]]]], 3], {n, 2, 11}]] (* From Harvey P. Dale, Dec 18 2011 *)
|
|
|
CROSSREFS
|
Cf. A130817, A152272, A152273, A152274, A152276, A152277, A152278, A152279, A152280, A152281.
Sequence in context: A197355 A121777 A056621 * A083385 A188450 A121766
Adjacent sequences: A152272 A152273 A152274 * A152276 A152277 A152278
|
|
|
KEYWORD
|
base,nonn
|
|
|
AUTHOR
|
Jon E. Schoenfield (jonscho(AT)hiwaay.net), Dec 01 2008
|
|
|
STATUS
|
approved
|
| |
|
|
