login
A020940
Greatest k such that (k-th prime) < (10 times n-th prime).
8
8, 10, 15, 19, 29, 31, 39, 42, 50, 61, 63, 73, 80, 82, 91, 99, 107, 111, 121, 127, 129, 138, 145, 154, 163, 169, 172, 180, 181, 189, 205, 214, 219, 221, 237, 239, 247, 258, 263, 269, 278, 279, 292, 293, 297, 300, 317, 331, 337, 340, 344, 355, 357, 368, 375
OFFSET
1,1
MATHEMATICA
PrimePi[#]&/@(NextPrime[10#, -1]&/@Prime[Range[60]]) (* Harvey P. Dale, Aug 03 2017 *)
CROSSREFS
Sequence in context: A063190 A101763 A154568 * A287557 A242732 A270796
KEYWORD
nonn,easy
EXTENSIONS
More terms from James A. Sellers
STATUS
approved