login
A152279
Number of 7's among the digits of all n-digit primes.
9
1, 8, 69, 574, 5520, 52155, 502179, 4882568, 47709672, 468269438, 4610668567, 45510662200, 450072137956, 4457717637910
OFFSET
1,2
KEYWORD
base,nonn
AUTHOR
Jon E. Schoenfield, Dec 01 2008
EXTENSIONS
a(12)-a(14) from Giovanni Resta, Jul 20 2015
STATUS
approved