A095191 - OEIS

A095191

Composites k such that k + A001414(k) is a semiprime.

8, 9, 18, 22, 24, 25, 28, 36, 39, 40, 50, 52, 54, 56, 62, 66, 69, 77, 80, 81, 87, 91, 92, 94, 95, 104, 106, 108, 115, 119, 120, 121, 122, 124, 126, 128, 133, 134, 136, 138, 142, 144, 146, 152, 159, 164, 170, 172, 183, 184, 187, 189, 196, 198, 202, 213, 214, 218, 219

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

EXAMPLE

462 = 2*3*7*11 so 462 + (2+3+7+11) = 485 = 5*97, a semiprime.

MATHEMATICA

seqQ[n_] := CompositeQ[n] && PrimeOmega[n + Plus @@ Times @@@ FactorInteger[n]] == 2; Select[Range[220], seqQ] (* Amiram Eldar, Dec 16 2019 *)

CROSSREFS

Cf. A001358, A001414.

Sequence in context: A356699 A057104 A359062 * A050706 A159836 A230542