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A280380 First occurrence of A280379(k) = n. 0
1, 2, 30, 46, 374, 2146, 5945, 14855, 24702 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

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

LINKS

Table of n, a(n) for n=0..8.

EXAMPLE

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

PROG

(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++)

)

}

CROSSREFS

Cf. A056171, A104272.

Sequence in context: A105962 A113695 A098827 * A184238 A285220 A078208

Adjacent sequences:  A280377 A280378 A280379 * A280381 A280382 A280383

KEYWORD

nonn

AUTHOR

John W. Nicholson, Jan 09 2017

STATUS

approved

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Last modified August 23 13:53 EDT 2019. Contains 326227 sequences. (Running on oeis4.)