A045858 Numbers whose square has initial digit '4'.

2, 7, 20, 21, 22, 64, 65, 66, 67, 68, 69, 70, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 633, 634, 635, 636, 637, 638, 639, 640, 641, 642, 643, 644, 645, 646, 647, 648, 649, 650, 651

Offset

1,1

Links

Seiichi Manyama, Table of n, a(n) for n = 1..10000

Mathematica

Select[Range[700], IntegerDigits[#^2][[1]]==4&] (* Harvey P. Dale, Nov 01 2025 *)

Crossrefs

Cf. A045787.

Sequence in context: A373765 A170869 A162355 * A160677 A035402 A182655

Adjacent sequences: A045855 A045856 A045857 * A045859 A045860 A045861

Keyword

nonn,base

Author

Jeff Burch

Status

approved