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 A128817 Primes which are 4 greater than the product of lesser twin primes. 0
 7, 19, 81349, 3335149, 196773559, 13970922409, 150983758430839 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Also primes which are 4 greater than the terms of A097489, where A097489 = product of first n terms of A001359 and A001359 = Lesser of twin primes. a(8) = A097489(547) + 4 = 4.247...*10^2176. - Amiram Eldar, Jun 30 2024 LINKS Table of n, a(n) for n=1..7. FORMULA Define twinl#(n)as the product of the first n lesser twin primes. Then if twinl#+4 is prime, list it. EXAMPLE twinl#(2) = 3*5=15. 15+4 = 19 prime and the second term in the table. PROG (PARI) twinl(n) = /* The n-th lower twin prime */ { local(c, x); c=0; x=1; while(c

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Last modified August 6 00:15 EDT 2024. Contains 374957 sequences. (Running on oeis4.)