A291625 Numbers k such that 0 is the smallest decimal digit of k^2.

10, 20, 30, 32, 33, 40, 45, 47, 48, 49, 50, 51, 52, 53, 55, 60, 64, 70, 71, 78, 80, 84, 90, 95, 97, 98, 99, 100, 101, 102, 103, 104, 105, 110, 120, 130, 138, 140, 142, 143, 144, 145, 147, 148, 149, 150, 151, 152, 153, 155, 160, 170, 174, 175, 176, 179, 180

Offset: 1

Author

Colin Barker, Aug 28 2017

Keywords

• nonn
• base

Examples

			47 is in the sequence because 47^2 = 2209, the smallest decimal digit of which is 0.
		

Crossrefs

Cf. A291626, A291627, A291628, A291629, A291630, A291631.

Programs

PARI

select(k->vecmin(digits(k^2))==0, vector(1000, k, k))

Python

A291625_list = [k for k in range(1,10**6) if '0' in str(k**2)] # Chai Wah Wu, Aug 28 2017