23171

Appears in sequences

• Number of positive integers <= 2^n of form 2*x^2 + 3*y^2.at n=17A000075
• Powers of sqrt(2) rounded up.at n=29A017912
• Diagonal in array of n-gonal numbers A081422.at n=28A081435
• Numbers k such that floor(k*sqrt(2)) is a power of 2.at n=9A103341
• Number of up steps starting at an even level in all nondecreasing Dyck paths of semilength n. A nondecreasing Dyck path is a Dyck path for which the sequence of the altitudes of the valleys is nondecreasing.at n=9A121523
• Number of squares <= 2^n.at n=29A136417
• The non-common part of the smaller number of an amicable pair.at n=20A180326
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of B(x)^k, where B(x) is the g.f. of A384650.at n=51A384654