A045855 Numbers whose square has initial digit '1'.

1, 4, 10, 11, 12, 13, 14, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136

Offset: 1

Author

Jeff Burch

Keywords

• nonn
• base

Links

• N. J. A. Sloane, Table of n, a(n) for n = 1..20000

Crossrefs

Cf. A045784, A272671.

Programs

Mathematica

Select[Range[150],First[IntegerDigits[#^2]]==1&] (* Harvey P. Dale, Aug 28 2012 *)