A240476 Primes that are not midway between the closest flanking squarefree numbers.

3, 5, 7, 11, 13, 23, 29, 31, 37, 41, 43, 47, 59, 61, 67, 71, 73, 79, 83, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 167, 173, 179, 181, 191, 193, 211, 223, 227, 229, 239, 241, 257, 263, 277, 281, 283, 311, 313, 317, 331, 347, 349, 353

Offset

1,1

Comments

Primes for which the corresponding A240473(m) is not equal to A240474(m).

Primes not equal to the average of the closest flanking squarefree numbers.

Primes not equal to the average of three consecutive squarefree numbers.

Complement of A240475 relative to A000040.

Links

Chris Boyd, Table of n, a(n) for n = 1..10000

Example

29 is a term because it is not midway between the closest flanking squarefree numbers 26 and 30.
On the other hand, 19 is not a term because it is midway between the closest flanking squarefree numbers 17 and 21.

Prog

(PARI) forprime(p=1, 353, forstep(j=p-1, 1, -1, if(issquarefree(j), L=j; break)); for(j=p+1, 2*p, if(issquarefree(j), G=j; break)); if(G-p!=p-L, print1(p", ")))

Crossrefs

Cf. A000040, A075430, A075432, A240473, A240474, A240475

Sequence in context: A169969 A291175 A174350 * A040140 A066651 A182583

Adjacent sequences: A240473 A240474 A240475 * A240477 A240478 A240479

Keyword

nonn

Author

Chris Boyd, Apr 06 2014

Status

approved