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

1,1

Comments

Numbers in A013590 that are not squarefree.

Links

Table of n, a(n) for n=1..54.

Prog

(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

Crossrefs

Cf. A013590, A013595.

Sequence in context: A210891 A076648 A323380 * A295990 A349868 A349937

Adjacent sequences: A256572 A256573 A256574 * A256576 A256577 A256578

Keyword

nonn

Author

Derek Orr, Apr 22 2015

Status

approved