A309671 Primes prime(m) such that G = prime(m-1)# - prime(m) is prime.

7, 11, 13, 17, 23, 83, 89, 97, 151, 373, 433, 857, 4013, 8821, 12959

Offset

1,1

Comments

G = prime(n-1)# - prime(n) where G is a prime is a special case of A090188 where (k=1).

Links

Table of n, a(n) for n=1..15.

Example

7 is a term because 23 = 2*3*5 - 7 is prime.

Prog

(PARI) primo(p) = my(ip=primepi(p)); factorback(primes(ip)); \\ A002110
isok(p) = isprime(p) && isprime(primo(precprime(p-1)) - p);

Crossrefs

Cf. A002110, A065314, A060882, A096649, A090188, A065316.

Sequence in context: A103485 A191079 A279190 * A073704 A040108 A038931

Adjacent sequences: A309668 A309669 A309670 * A309672 A309673 A309674

Keyword

nonn,more

Author

Mohamed Sami Gattoufi, Aug 11 2019

Status

approved