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URL: https://oeis.org/A240476

⇱ A240476 - OEIS

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A240476
Primes that are not midway between the closest flanking squarefree numbers.
4
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.
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", ")))
KEYWORD
nonn
AUTHOR
Chris Boyd, Apr 06 2014
STATUS
approved