A172240 Odd primes not in A181669.

3, 7, 13, 17, 19, 29, 31, 37, 41, 43, 53, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 173, 181, 191, 193, 197, 199, 211, 223, 229, 233, 239, 241, 251, 257, 263, 269, 271

Offset

1,1

Comments

Except for term 5, the sequence contains all greater of twin primes

Links

Table of n, a(n) for n=1..48.

Maple

isA172240 := proc(n::integer)
    type(n, 'odd') and isprime(n) and not isA181669(n) ; # reuse code of A181669
    simplify(%) ;
end proc:
for n from 2 to 1000 do
    if isA172240(n) then
        printf("%d, ", n) ;
    end if;
end do: # R. J. Mathar, Oct 17 2025

Crossrefs

Cf. A001359, A173176, A172487, A181669, A181602, A173641.

Sequence in context: A100807 A290400 A040999 * A129901 A067073 A323579

Adjacent sequences: A172237 A172238 A172239 * A172241 A172242 A172243

Keyword

nonn,easy

Author

Giovanni Teofilatto, Nov 20 2010

Status

approved