A280380 First occurrence of A280379(k) = n.

1, 2, 30, 46, 374, 2146, 5945, 14855, 24702

Offset: 0

Author

John W. Nicholson, Jan 09 2017

Keywords

• nonn

Comments

n < log(a(n)) for a(n) < 1.1*10^6.

Examples

			For prime(30)=113, A056171(113) = 14, A104272(12)=107 and A104272(13) = 127, so 14 - 12 = 2 (First occurrence).
		

Crossrefs

Cf. A056171, A104272.

Programs

PARI

\\RR[x] is a list of Ramanujan primes, A104272.
{plimit=1.1*10^6;i=n=s=0;
forprime(p=2,plimit,
s++;
if(p==RR[n+1],n++);
if(i==s-primepi(floor(p/2))-n,print(i," ",s);i++)
)
}