login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A035073
a(n) is root of square starting with digit 6: first term of runs.
3
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
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
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Nov 15 1998
STATUS
approved