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A069560 Squares in which the k-th significant digit either divides k or is a multiple of k. 1

%I #6 Dec 05 2013 19:55:15

%S 1,4,9,16,25,49,64,81,121,144,169,324,361,625,961,1369,1681,2116,2916,

%T 4624,8649,11664,12321,14161,14641,51984,114921,151321,214369,311364,

%U 351649,1151329,1252161,1658944,7311616,7354944,41254929,41654116

%N Squares in which the k-th significant digit either divides k or is a multiple of k.

%C If the smallest prime divisor of n is > 7 then the n-th digit is 1.

%e 8649 is a member in which the fourth digit is 8 a multiple of 4, the third one is 6 a multiple of 3, the second one is 4 a multiple of 2 and the least significant digit is 9.

%Y Cf. A069556, A069557, A069558, A069559.

%K base,nonn

%O 0,2

%A _Amarnath Murthy_, Mar 22 2002

%E More terms from _Sascha Kurz_, Mar 23 2002

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Last modified June 1 18:31 EDT 2024. Contains 373027 sequences. (Running on oeis4.)