A166403 Terms of sequence A166401 that are not powers of primes.

18, 36, 50, 75, 98, 100, 144, 147, 162, 196, 200, 225, 242, 245, 324, 338, 363, 392, 400, 441, 484, 507, 576, 578, 605, 676, 722, 784, 845, 847, 867, 882, 900, 968, 1058, 1083, 1089, 1156, 1183, 1225, 1250, 1296, 1352, 1444, 1445, 1458, 1521, 1587, 1600, 1682

Offset

1,1

Comments

Sequence A166401 contains the powers of the primes in addition to this sequence's terms. For those terms of A166401 that are composite, see A166402.

Links

Ivan Neretin, Table of n, a(n) for n = 1..10000

Mathematica

Select[Range[2, 1700], ! PrimePowerQ[#] && Divisible[(d = Divisors[#])[[n = Floor[Length[d]/2 + 1]]], d[[-n]]] &] (* Ivan Neretin, Jan 12 2016 *)

Crossrefs

Cf. A166401, A166402

Sequence in context: A261991 A109428 A329611 * A004941 A004961 A008600

Adjacent sequences: A166400 A166401 A166402 * A166404 A166405 A166406

Keyword

nonn

Author

Leroy Quet, Oct 13 2009

Extensions

More terms from Max Alekseyev, Feb 23 2010

Status

approved