|
| |
|
|
A078725
|
|
Prime(n*(n+1)/2+4).
|
|
0
| |
|
|
7, 11, 17, 29, 43, 67, 97, 131, 173, 227, 277, 349, 421, 499, 599, 683, 809, 919, 1039, 1181, 1307, 1483, 1621, 1811, 2003, 2207, 2389, 2633, 2819, 3067, 3329, 3571, 3833, 4099, 4397, 4691, 5003, 5347, 5657, 6007, 6329, 6703, 7057, 7499, 7873, 8287, 8707, 9133
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,1
|
|
|
FORMULA
| More generally one may consider the sequence S(n, m) = prime(n*(n+1)/2+m+1), for m=1, 2, 3...
|
|
|
PROG
| (PARI) triprimes(n, m) = { sr = 0; for(j=m, n, x = j*(j+1)/2+m+1; z = prime(x); sr+=1.0/z; print1(z" "); ); print(); print(sr); }
|
|
|
CROSSREFS
| Apart from initial terms, primes in fourth diagonal of triangle in A078721.
Sequence in context: A156105 A062574 A063912 * A019418 A068674 A156112
Adjacent sequences: A078722 A078723 A078724 * A078726 A078727 A078728
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Cino Hilliard (hillcino368(AT)gmail.com), Dec 20 2002
|
| |
|
|
