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

Author

Lekraj Beedassy, May 17 2010

Keywords

• nonn
• base

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.

Examples

			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.