A115434 - OEIS

A115434

Numbers k such that the concatenation of k with k-7 gives a square.

%I #5 Jul 15 2021 06:22:04

%S 8,16,1337032,2084503,2953232,4023943,1330033613070195328,

%T 4036108433661798551,8283744867954114232,

%U 6247320195351414276186411625291,9452080202814205132771066881607

%N Numbers k such that the concatenation of k with k-7 gives a square.

%e 4023943_4023936 = 6343456^2.

%Y Cf. A030465, A102567, A115426, A115437, A115428, A115429, A115430, A115431, A115432, A115433, A115435, A115436, A115445.

%K base,nonn

%O 1,1

%A _Giovanni Resta_, Jan 25 2006