A045861 Numbers whose square has initial digit '7'.

27, 28, 84, 85, 86, 87, 88, 89, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 837, 838, 839, 840, 841, 842, 843, 844, 845, 846, 847, 848, 849, 850, 851, 852, 853, 854, 855, 856, 857, 858, 859, 860, 861, 862, 863

Offset: 1

Author

Jeff Burch

Keywords

• nonn
• base

Links

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

Crossrefs

Cf. A045791.

Programs

Mathematica

Flatten[Table[Range[Ceiling[Sqrt[7 10^i]],Floor[Sqrt[8 10^i-1]]],{i,2,5}]]  (* Harvey P. Dale, Mar 06 2011 *)