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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
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
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified April 21 03:36 EDT 2024. Contains 371850 sequences. (Running on oeis4.)