RosettaCodeData/Task/Babbage-problem/J/babbage-problem-1.j

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square=: ^&2
modulo1e6=: 1000000&|
trythese=: i. 1000000 NB. first million nonnegative integers
which=: I. NB. position of true values
which 269696=modulo1e6 square trythese NB. right to left <-
25264 99736 150264 224736 275264 349736 400264 474736 525264 599736 650264 724736 775264 849736 900264 974736