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A045860 Numbers whose square has initial digit '6'. 4
8, 25, 26, 78, 79, 80, 81, 82, 83, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 263, 264, 775, 776, 777, 778, 779, 780, 781, 782, 783, 784, 785, 786, 787, 788, 789, 790, 791, 792, 793, 794, 795, 796, 797, 798, 799 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Flatten[Table[Range[Ceiling[Sqrt[6*10^n]], Floor[Sqrt[7*10^n]]], {n, 5}]] (* Harvey P. Dale, Apr 03 2013 *)

PROG

(Python)

from math import isqrt

def aupto(limit):

    alst, d, end = [], 1, 0

    while end < limit:

        start, end = isqrt(6*10**d) + 1, isqrt(7*10**d-1)

        alst.extend([an for an in list(range(start, end+1)) if an <= limit])

        d += 1

    return alst

print(aupto(799)) # Michael S. Branicky, Aug 25 2021

CROSSREFS

Supersequence of A035073.

Cf. A045789.

Sequence in context: A254341 A188477 A302632 * A081504 A030796 A266927

Adjacent sequences:  A045857 A045858 A045859 * A045861 A045862 A045863

KEYWORD

nonn,base

AUTHOR

Jeff Burch

STATUS

approved

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Last modified December 4 22:42 EST 2021. Contains 349526 sequences. (Running on oeis4.)