1,1

E.W. Weisstein, Cullen Number

Sum of all 1-digit Cullen numbers is 13.

Sum of all 2-digit Cullen numbers is 90.

Sum of all 3-digit Cullen numbers is 1443.

Cf. A002064.

Sequence in context: A026912 A057788 A166215 this_sequence A156947 A139613 A008505

Adjacent sequences: A131697 A131698 A131699 this_sequence A131701 A131702 A131703

nonn,base

Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Sep 15 2007