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Index of 8^n within sequence of numbers of form 5^i*8^j.
1

%I #9 May 18 2022 07:54:24

%S 1,3,6,10,16,23,31,41,52,64,77,92,108,125,144,164,185,207,231,256,282,

%T 310,339,369,401,434,468,503,540,578,617,658,700,743,787,833,880,928,

%U 978,1029,1081,1134,1189,1245,1302,1361,1421,1482,1545,1609,1674,1740,1808

%N Index of 8^n within sequence of numbers of form 5^i*8^j.

%Y Cf. A001018, A025623.

%Y Differs from A025714 at a(65).

%K nonn

%O 1,2

%A _David W. Wilson_