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Numbers k such that k is a substring of 9^k.
7

%I #15 Feb 19 2024 01:56:24

%S 5,7,9,25,26,31,37,43,46,47,48,53,59,60,61,63,68,69,70,72,74,76,80,85,

%T 87,88,89,91,94,97,101,104,107,124,132,135,140,148,158,166,170,180,

%U 187,190,199,209,211,215,231,243,244,256,266,270,271,279,283,288,289,291

%N Numbers k such that k is a substring of 9^k.

%Y Cf. A032740, A049301, A049302, A049303, A049304, A049305, A049306.

%K nonn,base,easy

%O 1,1

%A _David W. Wilson_