OFFSET
1,1
COMMENTS
The average of twin primes is a member.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
EXAMPLE
34 is sandwiched between 33 and 35 which are of the form p*q where p and q are primes.
MAPLE
k := 0: for j from 2 to 5000 do if not isprime(j) then a := ifactors(j-1): b := ifactors(j+1): if sort([seq(a[2][i][2], i= 1..nops(a[2]))])= sort([seq(b[2][i][2], i= 1..nops(b[2]))]) then k := k+1: c[k] := j: fi: fi: od: seq(c[i], i= 1..k);
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Aug 21 2002
EXTENSIONS
More terms from Sascha Kurz, Aug 22 2002
Offset corrected by Amiram Eldar, Jan 02 2020
STATUS
approved