OFFSET
1,2
COMMENTS
This triangle consists of those columns of A278112 that have prime index.
LINKS
Jason Kimberley, Table of n, a(i) for i = 1..10126 (T(n,k) for n = 1..46
FORMULA
EXAMPLE
The first eight rows are:
1;
2, 1, 1, 1;
3, 2, 1, 1, 1, 1, 1;
4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1;
5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1;
6, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1;
7, 5, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1;
8, 6, 5, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1;
MATHEMATICA
Table[Floor[n Sqrt[2/Prime@ k]], {n, 8}, {k, PrimePi[2 n^2]}] // Flatten (* Michael De Vlieger, Feb 17 2017 *)
PROG
CROSSREFS
KEYWORD
nonn,tabf,easy
AUTHOR
Jason Kimberley, Feb 09 2017
STATUS
approved