A077515 Smallest n-digit number beginning with n and having n divisors, or 0 if no such number exists.

1, 23, 361, 4006, 0, 600004, 0, 80000001, 900060001, 1000000016, 0, 120000000020, 0, 14000000002112, 150000300946521, 1600000000000005, 0, 180000000000000639, 0, 20000000000000000048, 210000002255164326976, 2200000000000000037888, 0, 240000000000000000000004

Offset

1,2

Links

Table of n, a(n) for n=1..24.

Example

a(5) = 0 as 13^4 = 28561 < 50000 < 59999 < 83521 = 17^4.

Crossrefs

Cf. A077516.

Sequence in context: A180361 A021684 A138578 * A025942 A020000 A021664

Adjacent sequences: A077512 A077513 A077514 * A077516 A077517 A077518

Keyword

base,nonn

Author

Amarnath Murthy, Nov 08 2002

Extensions

More terms from Ray Chandler, Aug 14 2003

a(24) from Jon E. Schoenfield, Mar 17 2022

Status

approved