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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..14.

CROSSREFS

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

Sequence in context: A091590 A087487 A178368 * A015575 A214344 A228421

Adjacent sequences:  A152276 A152277 A152278 * A152280 A152281 A152282

KEYWORD

base,nonn

AUTHOR

Jon E. Schoenfield, Dec 01 2008

EXTENSIONS

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

STATUS

approved

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Last modified August 18 10:51 EDT 2017. Contains 290710 sequences.