OFFSET

1,1

COMMENTS

Conjecture: Each integer n > 4 can be written as a_1 + ... + a_k, where a_1,...,a_k are numbers of the form 2^a + 5^b (a,b>=0) (i.e., terms of the current sequence) with no one dividing another. This has been verified for n = 5..1200. - Zhi-Wei Sun, Apr 14 2023

LINKS

T. D. Noe, Table of n, a(n) for n = 1..10000

MATHEMATICA

a = 2; b = 5; mx = 3000; Union[Flatten[Table[a^n + b^m, {m, 0, Log[b, mx]}, {n, 0, Log[a, mx - b^m]}]]]

CROSSREFS

KEYWORD

nonn

AUTHOR

T. D. Noe, Jun 19 2013

STATUS

approved