A342552 The number of twin primes between prime(i)*prime(i+1) and prime(i+1)*prime(i+2) where prime(i) and prime(i+1) are twin primes.

2, 3, 4, 3, 5, 6, 9, 11, 8, 12, 24, 19, 34, 14, 27, 14, 28, 17, 46, 26, 24, 55, 28, 14, 86, 50, 38, 66, 28, 67, 76, 41, 64, 40, 43, 93, 53, 87, 67, 48, 89, 66, 42, 72, 69, 76, 49, 76, 42, 49, 59, 73, 260, 109, 145, 169, 70, 137, 193, 292

Offset

1,1

Links

Table of n, a(n) for n=1..60.

Prog

(PARI) {for(n=1, 200, if(prime(n+1)-prime(n)==2, my(a=prime(n)*prime(n+1), b=prime(n+1)*prime(n+2), c=0); for(m=a, b, if(isprime(m)==1&&isprime(m+2)==1, c=c+1)); print1(c, ", ")))}

Crossrefs

Cf. A171727, A006094, A001359, A006512, A037074.

Sequence in context: A319350 A336855 A329895 * A078908 A159797 A152920

Adjacent sequences: A342549 A342550 A342551 * A342553 A342554 A342555

Keyword

nonn

Author

Zhandos Mambetaliyev, Mar 27 2021

Status

approved