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A323354
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Odd n such that A015525(n) is not squarefree.
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2
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5, 15, 25, 35, 45, 51, 55, 65, 75, 85, 95, 105, 115, 125, 135, 145, 153, 155, 165, 175, 185, 195, 205, 215, 225, 235, 245, 255, 265, 275, 285, 295, 305, 315, 325, 335, 345, 355, 357, 365, 375, 385, 395, 405, 415, 425, 435, 445, 455, 459, 465, 475, 485
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(1) = 5: A015525(5) = 361 = 19^2. All multiples of 5 are in the sequence and have 19^2 as a factor.
a(6) = 51: A015525(51) = 3005793749329960987137864733842257 = 17^2 * 67 * 307 * 624669523 * 809464558443747299.
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PROG
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(PARI) anm2=1; anm1=3; for(n=3, 155, an=3*anm1+8*anm2; anm2=anm1; anm1=an; if(n%2&&!issquarefree(an), print1(n, ", ")))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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