

A253278


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


1



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
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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

JuriStepan Gerasimov, May 02 2015


EXTENSIONS

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


STATUS

approved



