A086558 Smallest n-digit number beginning with n and having prime signature of n, or 0 if no such number exists.

1, 23, 307, 4489, 50021, 600007, 7000003, 80062991, 900660121, 1000000006, 11000000021, 120000000004, 1300000000021, 14000000000001, 150000000000017, 1604502443050081, 17000000000000009, 180000000000000027

Offset: 1

Author

Amarnath Murthy, Aug 30 2003

Keywords

• base
• nonn

Comments

Conjecture: no term is zero.

Examples

			a(4) = 4489 = 67^2, 4= 2^2. a(12) = 120000000004= 2^2*30000000001, prime signature: p^2*q.
		

Extensions

Corrected and extended by Sascha Kurz, Sep 22 2003