A193769 Numbers of the form (3^a+5^b)/2 ; a,b >= 0 (with repetition).

1, 2, 3, 4, 5, 7, 13, 14, 14, 16, 17, 26, 41, 43, 53, 63, 64, 67, 76, 103, 122, 124, 134, 184, 313, 314, 317, 326, 353, 365, 367, 377, 427, 434, 677, 1094, 1096, 1106, 1156, 1406, 1563, 1564, 1567, 1576, 1603, 1684, 1927, 2656

Offset: 1

Author

M. F. Hasler, Jan 01 2013

Keywords

• nonn

Comments

Elements of the table A193770 (motivated by the less fundamental A081458), sorted by increasing size.

The value 14 = (3^1+5^2)/2 = (3^3+5^0)/2, therefore it occurs twice.

Crossrefs

Cf. A193770 (the table), A081458 (the subtable obtained for even a,b).

Programs

PARI

select( t->t<3000, vecsort(concat(Vec( matrix(9,6,x,y,(3^(x-1)+5^(y-1))/2 )))))