A247380 First differences of A117495.

3, 7, 11, 23, 21, 37, 31, 51, 77, 49, 97, 85, 67, 99, 137, 149, 93, 169, 143, 111, 199, 167, 221, 281, 197, 153, 211, 163, 225, 533, 251, 323, 203, 479, 219, 367, 379, 315, 401, 413, 261, 601, 277, 369, 287, 751, 775, 415, 325, 429, 539, 343, 771, 575, 587, 599

Offset

1,1

Links

Alois P. Heinz, Table of n, a(n) for n = 1..10000

Formula

a(n) = A117495(n+1) - A117495(n).

Maple

with(numtheory):
a:= n-> ithprime(n+1)*n-ithprime(n)*(n-1):
seq(a(n), n=1..60);  # Alois P. Heinz, Sep 15 2014

Prog

(PARI) a(n)=my(p=prime(n++)); p+n*(nextprime(p+1)-p) \\ Charles R Greathouse IV, Sep 15 2014

Crossrefs

Cf. A000040, A117495.

Sequence in context: A028831 A244572 A137516 * A187265 A187266 A187267

Adjacent sequences: A247377 A247378 A247379 * A247381 A247382 A247383

Keyword

easy,nonn

Author

Odimar Fabeny, Sep 15 2014

Extensions

More terms from Alois P. Heinz, Sep 15 2014

Status

approved