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A168025
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Non-composite numbers in the western ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American.
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5
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1, 19, 151, 1621, 2731, 3631, 4129, 7789, 11719, 12601, 14461, 15439, 17491, 20809, 28309, 29671, 32491, 41719, 59659, 69829, 78541, 83089, 85411, 92569, 97501, 115771, 132679, 138571
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