A374591 Even numbers that can be written as the sum of two isolated primes (A007510).

4, 46, 60, 70, 74, 76, 84, 90, 94, 100, 102, 104, 106, 112, 114, 116, 120, 126, 130, 132, 134, 136, 142, 144, 146, 150, 154, 156, 158, 160, 162, 164, 166, 168, 172, 174, 176, 178, 180, 184, 186, 190, 192, 194, 196, 198, 200, 202, 204, 206, 210, 214, 216, 220

Offset

1,1

Links

Table of n, a(n) for n=1..54.

Example

4 = 2 + 2 is a term, as 2 is the smallest isolated prime.
60 = 23 + 37 is the smallest term that is the sum of two distinct isolated primes.

Mathematica

Lim=220; ip=Select[Prime[Range[Lim]], NoneTrue[#+{2, -2}, PrimeQ]&] ; ipp[a_]:={a, a}; Select[Union[Total/@Join[ipp/@ip, Subsets[ip, {2}]]], EvenQ[#]&&#<=Lim&] (* James C. McMahon, Aug 10 2024 *)

Crossrefs

Cf. A007510.

Sequence in context: A349866 A222899 A119729 * A134110 A176312 A309450

Adjacent sequences: A374588 A374589 A374590 * A374592 A374593 A374594

Keyword

nonn

Author

Marc Groz, Jul 12 2024

Status

approved