A253278 Congruentfree numbers: positive integers that are not divisible by any congruent number (A003273).

1, 2, 3, 4, 8, 9, 11, 16, 17, 19, 27, 32, 33, 43, 51, 57, 59, 64, 67, 73, 81, 83, 89, 97, 99, 107, 113, 121, 128, 129, 131, 139, 146, 153, 163, 171, 177, 178, 179, 187, 193, 201, 209, 211, 227, 233, 241, 243, 249, 251, 256, 267, 281, 283, 289, 292, 297, 307

Offset: 1

Author

Juri-Stepan Gerasimov, May 02 2015

Keywords

• nonn

Examples

			8 is in this sequence because the positive integer 8 is not divisible by any of the first 3 congruent numbers 5, 6, 7.
		

Crossrefs

Cf. A003273, A257604.

Programs

PARI

isok(n,v) = {my(k=1); while (v[k] <= n, if (n % v[k] == 0, return (0)); k++;); return (1);}
lista(nn) = {v = readvec("b003273.txt"); for (n=1, nn, if (isok(n, v), print1(n, ", ")););} \\ Michel Marcus, May 03 2015

Extensions

Corrected by Michel Marcus, May 03 2015. Edited by Wolfdieter Lang, May 05 2015