A138856 Numbers such that all subsets of {prime(a(1)), ..., prime(a(n))} have a different sum.

1, 2, 4, 5, 10, 16, 28, 47, 83, 147, 267, 481, 882, 1621, 2997, 5578, 10428, 19560, 36849, 69649, 131983, 250841, 477992, 912662, 1746404, 3347928, 6429526, 12366247, 23820901, 45947255, 88742186, 171594310, 332169919, 643674781, 1248523100, 2423948034

Offset: 1

Author

M. F. Hasler, Apr 10 2008

Keywords

• nonn

Comments

See A138000, A138857 and A138858.

Crossrefs

Cf. A064934, A138000, A138001, A138857, A138858.

Programs

PARI

{s=1;p=0; for( n=1,20, until( !bitand( s, s>>prime(p++) ),); s+=s<
				

Formula

a(n) = primepi(A138000(n)).

Extensions

a(22)-a(30) from Donovan Johnson, Oct 03 2009

a(31)-a(36) from Amiram Eldar, Sep 06 2024