A323354 Odd n such that A015525(n) is not squarefree.

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

Offset: 1

Author

Hugo Pfoertner, Jan 12 2019

Keywords

• nonn

Examples

			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.
		

Links

• Hugo Pfoertner, Table of n, a(n) for n = 1..5487

Crossrefs

Cf. A015525, A323353.

Programs

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,", ")))