OFFSET
1,1
COMMENTS
The 5-almost primes are the numbers that are the product of exactly five (not necessarily distinct).
EXAMPLE
a(1) = 252 = 2*2*3*3*7;
a(2) = 92529 = 3*3*3*23*149.
MATHEMATICA
d[n_]:= IntegerDigits[n]; t = {x = 252}; Do[i = 1; While[!PrimeOmega[y = FromDigits[Flatten[{z = d[i], d[x], Reverse[z]}]]]==5, i++]; AppendTo[t, x = y], {n, 13}]; t
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Michel Lagneau, Dec 01 2014
STATUS
approved