A035076
a(n) is root of square starting with digit 9: first term of runs.
Original entry on oeis.org
30, 95, 300, 949, 3000, 9487, 30000, 94869, 300000, 948684, 3000000, 9486833, 30000000, 94868330, 300000000, 948683299, 3000000000, 9486832981, 30000000000, 94868329806, 300000000000, 948683298051, 3000000000000
Offset: 2
A035075
a(n) = ceiling(sqrt(8*10^n)).
Original entry on oeis.org
9, 29, 90, 283, 895, 2829, 8945, 28285, 89443, 282843, 894428, 2828428, 8944272, 28284272, 89442720, 282842713, 894427191, 2828427125, 8944271910, 28284271248, 89442719100, 282842712475, 894427191000, 2828427124747
Offset: 1
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Ceiling[Sqrt[8*10^Range[30]]] (* Harvey P. Dale, Apr 12 2013 *)
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from math import isqrt
def a(n): return isqrt(8*10**n) + 1
print([a(n) for n in range(1, 25)]) # Michael S. Branicky, Sep 29 2021
A067472
Smallest n-digit square starting with 2.
Original entry on oeis.org
25, 225, 2025, 20164, 200704, 2002225, 20007729, 200024449, 2000057284, 20000182084, 200000361796, 2000001237796, 20000000402496, 200000010642496, 2000000040249600, 20000000215721449, 200000000447251216
Offset: 2
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Table[Ceiling[Sqrt[2*10^(n-1)]]^2,{n,2,30}] (* Harvey P. Dale, Apr 18 2021 *)
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for(n=2,25,a=ceil(sqrt(2*10^(n-1)))^2; print(a))
Showing 1-3 of 3 results.
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