OFFSET
0,1
COMMENTS
Since sigma(a(n)) = (2^(n+1) - 1)*(1 + p_n + (p_n)^2) where p_n = A014210(n+1), lim_{n->infinity} sigma(a(n)) = 2*a(n).
FORMULA
a(n) = 2^n * A014210(n+1)^2, n >= 0.
EXAMPLE
a(4) = 16 * 37^2 = 21904 since 37 is the first prime larger than 32.
MATHEMATICA
a338510[n_] := 2^n NextPrime[2^(n+1)]^2/; n>=0
Map[a338510, Range[0, 20]]
CROSSREFS
KEYWORD
nonn
AUTHOR
Hartmut F. W. Hoft, Oct 31 2020
STATUS
approved