A256575 Nonsquarefree orders of cyclotomic polynomials containing a coefficient with an absolute value greater than one.

315, 420, 495, 525, 585, 630, 660, 735, 765, 780, 819, 825, 840, 855, 945, 975, 990, 1020, 1035, 1050, 1071, 1092, 1140, 1170, 1260, 1275, 1287, 1320, 1380, 1425, 1428, 1470, 1485, 1530, 1540, 1560, 1575, 1638, 1650, 1665, 1680, 1683, 1710, 1716, 1725, 1755, 1815, 1820, 1827, 1845, 1881, 1890, 1911, 1925

Offset: 1

Author

Derek Orr, Apr 22 2015

Keywords

• nonn

Comments

Numbers in A013590 that are not squarefree.

Crossrefs

Cf. A013590, A013595.

Programs

PARI

is(n)=if (!issquarefree(n), for(k=0, n, if(abs(polcoeff(polcyclo(n), k))>1, return(n))); 0)
for(n=1, 10^4, if(is(n), print1(n, ", "))) \\ edited by Michel Marcus, Apr 21 2018