A035073 a(n) is root of square starting with digit 6: first term of runs.

8, 25, 78, 245, 775, 2450, 7746, 24495, 77460, 244949, 774597, 2449490, 7745967, 24494898, 77459667, 244948975, 774596670, 2449489743, 7745966693, 24494897428, 77459666925, 244948974279, 774596669242, 2449489742784, 7745966692415, 24494897427832, 77459666924149

Offset

1,1

Links

Table of n, a(n) for n=1..27.

Formula

a(n) = ceiling(sqrt(6*10^n)), n > 0.

Prog

(Python)
from math import isqrt
def a(n): return isqrt(6*10**n) + 1
print([a(n) for n in range(1, 28)]) # Michael S. Branicky, Aug 25 2021

Crossrefs

Subsequence of A045860.

Cf. A067576 (squares), A035076 (2..9).

Sequence in context: A127813 A295911 A231791 * A041120 A042637 A133661

Adjacent sequences: A035070 A035071 A035072 * A035074 A035075 A035076

Keyword

nonn,base

Author

Patrick De Geest, Nov 15 1998

Status

approved