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A089629
Smallest member of a pair of consecutive twin prime pairs that have one prime between them.
2
17, 29, 59, 227, 269, 617, 1031, 1277, 1289, 1301, 1607, 1667, 1697, 2087, 2129, 2309, 2711, 2789, 3257, 3527, 3539, 3557, 3917, 4019, 4241, 4517, 4637, 4787, 5477, 5501, 5639, 6551, 7307, 8819, 8837, 8999, 9011, 10037, 10067, 10271, 10499, 12041, 13679
OFFSET
1,1
COMMENTS
Run the PARI script savetwins(100000) or so to build the twinprime array of lower bounds before you run the main script.
LINKS
EXAMPLE
Twin prime pairs 17,19 and 29,31 have only the prime 23 between them.
PROG
(PARI) pbetweentw(n, p) = \p is the number of primes between { forstep(x1=1, n, 1, c=0; t1 = twin[x1]; t2 = twin[x1+1]; for(y=t1+4, t2-1, if(isprime(y), c++) ); if(c==p, print1(t1", ")) ) } \ build a twin prime table of lower bounds savetwins(n) = { twin = vector(n); c=1; forprime(x=3, n*10, if(isprime(x+2), twin[c]=x; c++; ) ) }
CROSSREFS
Sequence in context: A342820 A190556 A241485 * A007349 A154616 A196938
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, Jan 01 2004
EXTENSIONS
Offset corrected by Amiram Eldar, Dec 28 2019
STATUS
approved