A225256 Minimum value unattainable as the sum of 2 attained values of a*b with a,b 0..n integers.

3, 7, 14, 23, 38, 47, 68, 87, 115, 147, 183, 203, 245, 291, 341, 395, 453, 503, 568, 619, 691, 767, 827, 887, 973, 1063, 1157, 1255, 1357, 1463, 1573, 1631, 1747, 1867, 1991, 2119, 2251, 2317, 2455, 2597, 2743, 2893, 3047, 3205, 3367, 3533, 3703, 3791, 3967

Offset: 1

Author

R. H. Hardin, May 04 2013

Keywords

• nonn

Comments

Related to A225252.

Links

• R. H. Hardin, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A225252, A225253.

Programs

PARI

a(n) = my(v=setbinop((x,y)->x+y, setbinop((x,y)->x*y, [0..n]))); for(k=0, vecmax(v)+1, if (!vecsearch(v, k), return(k))); \\ Michel Marcus, Sep 07 2023