A134334 -id:A134334 - cp's OEIS frontend

A231878 Numbers k such that bigomega(k)^2 (cf. A001222) divides k.

2, 3, 4, 5, 7, 11, 13, 16, 17, 18, 19, 23, 27, 29, 31, 37, 41, 43, 45, 47, 53, 59, 61, 63, 67, 71, 73, 79, 83, 89, 97, 99, 101, 103, 107, 109, 113, 117, 127, 131, 137, 139, 144, 149, 151, 153, 157, 163, 167, 171, 173, 179, 181, 191, 193, 197, 199, 200, 207, 211, 216, 223, 227, 229, 233, 239, 241, 251, 256, 257, 261, 263

Offset: 1

N. J. A. Sloane, Nov 17 2013

nonn

Contains all primes. - Ivan Neretin, Apr 05 2016

Ivan Neretin, Table of n, a(n) for n = 1..13517 (all terms up to 10^5)

Cf. A001221, A075592, A185307, A001222, A074946, A134334, A231879 (complement).

Select[Range[2, 265], Divisible[#, PrimeOmega[#]^2] &] (* Ivan Neretin, Apr 05 2016 *)

isok(n) = !(n % bigomega(n)^2); \\ Michel Marcus, Apr 05 2016

A231879 Numbers n such that bigomega(n)^2 (cf. A001222) does not divide n.

Original entry on oeis.org

1, 6, 8, 9, 10, 12, 14, 15, 20, 21, 22, 24, 25, 26, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 100, 102, 104, 105, 106, 108, 110, 111, 112, 114, 115

Offset: 1

N. J. A. Sloane, Nov 17 2013

nonn

Contains all semiprimes (A001358) except 4. - Ivan Neretin, Apr 05 2016

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

Cf. A001221, A075592, A185307, A001222, A074946, A134334, A231878 (complement).

Join[{1}, Select[Range[2, 115], ! Divisible[#, PrimeOmega[#]^2] &]] (* Ivan Neretin, Apr 05 2016 *)

lista(nn) = {print1(1, ", "); for(n=2, nn, if(n % bigomega(n)^2 != 0, print1(n, ", ")));} \\ Altug Alkan, Apr 05 2016

cp's OEIS Frontend

A231878 Numbers k such that bigomega(k)^2 (cf. A001222) divides k.

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