|
| |
|
|
A063645
|
|
Primes with two representations: p*q*r - 2 = u*v*w + 2 where p, q, r, u, v and w are primes.
|
|
1
| |
|
|
173, 277, 607, 929, 1129, 1181, 1237, 1493, 1549, 1597, 1613, 2011, 2063, 2137, 2423, 2677, 2753, 2767, 2797, 2819, 2851, 2917, 3449, 3533, 3607, 3617, 3727, 4013, 4073, 4177, 4201, 4253, 4493, 4523, 4583, 4691, 4919, 4951, 5119, 5237, 5273, 5393
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
|
|
|
EXAMPLE
| A063645(50) = 5821: 5821 = A063641(204)= 5823 - 2 = 3*3*647 - 2, 5821 = A063642(225)= 5819 + 2 = 11*23*23 + 2.
|
|
|
PROG
| (PARI) { n=0; for (m=2, 10^9, p=prime(m); if (bigomega(p + 2) == 3 && bigomega(p - 2) == 3, write("b063645.txt", n++, " ", p); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 27 2009]
|
|
|
CROSSREFS
| A063641, A063642, A014612.
Sequence in context: A178652 A119567 A142436 * A142607 A142206 A142004
Adjacent sequences: A063642 A063643 A063644 * A063646 A063647 A063648
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 21 2001
|
| |
|
|
