A116572 a(n) = floor(prime(n)/5) for n > 2, a(1) = a(2) = 1.

1, 1, 1, 1, 2, 2, 3, 3, 4, 5, 6, 7, 8, 8, 9, 10, 11, 12, 13, 14, 14, 15, 16, 17, 19, 20, 20, 21, 21, 22, 25, 26, 27, 27, 29, 30, 31, 32, 33, 34, 35, 36, 38, 38, 39, 39, 42, 44, 45, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 56, 58, 61, 62, 62, 63, 66, 67, 69

Offset: 1

Author

Roger L. Bagula, Mar 18 2006

Keywords

• nonn
• easy
• less

Links

• G. C. Greubel, Table of n, a(n) for n = 1..5000

Programs

Magma

[1,1] cat [NthPrime(n) div 5: n in [3..80]]; // Vincenzo Librandi, Apr 14 2015

Mathematica

Join[{1, 1}, Quotient[Prime[Range[3, 80]], 5]] (* Vincenzo Librandi, Apr 14 2015 *)

PARI

a(n)=if(n<5, 1, prime(n)\5) \\ Charles R Greathouse IV, Sep 21 2017

Extensions

More terms from Vincenzo Librandi, Apr 14 2015

Offset corrected by Charles R Greathouse IV, Sep 21 2017

New name from Charles R Greathouse IV, Sep 21 2017