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

1,2

Links

Table of n, a(n) for n=1..58.

Example

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

Prog

(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

Crossrefs

Cf. A003273, A257604.

Sequence in context: A139461 A126421 A116111 * A184807 A032859 A032883

Adjacent sequences: A253275 A253276 A253277 * A253279 A253280 A253281

Keyword

nonn

Author

Juri-Stepan Gerasimov, May 02 2015

Extensions

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

Status

approved