OFFSET
2,1
COMMENTS
PROG
(Python)
from sympy import isprime, prime, primerange
def aupton(terms):
phash, alst = 2, []
for p in primerange(3, prime(terms)+1):
phash *= p
for k in range(1, phash//2):
if isprime(phash-k) and isprime(phash+k): alst.append(phash-k); break
return alst
print(aupton(20)) # Michael S. Branicky, May 29 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, May 21 2004
EXTENSIONS
Corrected by T. D. Noe, Nov 15 2006
a(12)-a(20) from Donovan Johnson, Apr 27 2008
STATUS
approved