A152279 Number of 7's among the digits of all n-digit primes.

1, 8, 69, 574, 5520, 52155, 502179, 4882568, 47709672, 468269438, 4610668567, 45510662200, 450072137956, 4457717637910

Offset: 1

Author

Jon E. Schoenfield, Dec 01 2008

Keywords

• base
• nonn

Crossrefs

Cf. A130817, A152272, A152273, A152274, A152275, A152276, A152277, A152278, A152280, A152281.

Extensions

a(12)-a(14) from Giovanni Resta, Jul 20 2015