A101344 Number of primes between prime(n) and 3prime(n).

2, 2, 3, 4, 6, 6, 8, 8, 10, 13, 13, 17, 17, 17, 19, 21, 23, 24, 27, 27, 26, 29, 30, 32, 36, 36, 36, 38, 37, 38, 44, 45, 47, 46, 51, 51, 54, 55, 56, 57, 58, 58, 62, 62, 62, 62, 68, 73, 74, 74, 74, 75, 75, 79, 81, 82, 82, 83, 86, 86, 85, 89, 94, 94, 94, 95, 100, 101, 106, 105, 106

Offset

1,1

Links

Table of n, a(n) for n=1..71.

Example

a(1)=2 because between p=2 and 6 there are exactly two primes, 3
and 5.

Mathematica

Table[ PrimePi[3Prime[n]] - n, {n, 70}]

Crossrefs

Sequence in context: A289341 A263096 A246778 * A152048 A046934 A093594

Adjacent sequences: A101341 A101342 A101343 * A101345 A101346 A101347

Keyword

easy,nonn

Author

Giovanni Teofilatto, Dec 25 2004

Extensions

Corrected and extended by Ray Chandler, Dec 25, 2004

Status

approved