A079447 Primes p such that there is an integer k satisfying p = floor(k*H(k)) where H(k) denotes the k-th harmonic number (i.e., H(k) = 1 + 1/2 + 1/3 + ... + 1/k).

2, 3, 5, 11, 29, 37, 41, 67, 71, 149, 181, 191, 197, 229, 241, 251, 257, 307, 353, 359, 383, 389, 401, 443, 449, 461, 479, 521, 557, 563, 569, 647, 653, 661, 673, 743, 769, 787, 827, 887, 1033, 1129

Offset

1,1

Links

Table of n, a(n) for n=1..42.

Example

10*Sum_{j=1..10} 1/j = 29.2896825..., hence 29 = floor(10*H(10)) and 29 is in the sequence.

Crossrefs

Sequence in context: A055228 A173758 A098642 * A171832 A084865 A047934

Adjacent sequences: A079444 A079445 A079446 * A079448 A079449 A079450

Keyword

nonn

Author

Benoit Cloitre, Jan 13 2003

Status

approved