A177998 The n-digit prime with the largest number of zero decimal digits, the largest of these if there are more than one. Zero if no such prime exists.

0, 0, 907, 9007, 90007, 900007, 8000009, 40000003, 700000001, 9000000001, 40000000003, 700000000009, 8000000000009, 70000000000009, 940000000000007, 9000000000000007, 70000000000000003, 200000000000000003

Offset

1,3

Comments

The largest number of zero digits in the n-digit prime is n-2, because leading zeros are ignored and the last digit is >0 for primes.

Links

Table of n, a(n) for n=1..18.

Example

3-digit primes with one zero are 101, 103, 107,.., 907. The largest of these is 907, which defines a(3).

Crossrefs

Cf. A037053, A069675, A109902.

Sequence in context: A253228 A134075 A316679 * A253347 A253354 A204613

Adjacent sequences: A177995 A177996 A177997 * A177999 A178000 A178001

Keyword

nonn,base

Author

Lekraj Beedassy, May 17 2010

Status

approved