2490368

Appears in sequences

• a(n) = n*(n+3)*2^(n-3).at n=15A001793
• Primitive numbers k that divide sigma(k)*phi(k).at n=33A055196
• a(0)=0, a(1)=1, a(n) = n*2^(n-2) for n >= 2.at n=19A057711
• Products of exactly 18 primes (generalization of semiprimes).at n=20A069279
• a(n) = 19*2^n.at n=17A110288
• Numbers n such that A067824(n) = n.at n=32A122408
• Binomial transform of A124625.at n=19A129952
• a(n) is the smallest positive integer m with exactly n zeros in its binary representation and with n represented in binary as a substring of the binary representation of m.at n=18A147761
• Number of defective 3-colorings of an n X 2 0..2 array connected horizontally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..2 order.at n=9A229580
• Smallest number of the form 11*m+1 with exactly n prime factors, counted with multiplicity.at n=18A230123
• a(n) = the number of hills (arch length of 1 with no covering arches) for semi-meander solutions with n arches and floor((n+2)/2) arch group returns to the x axis.at n=36A262258
• Positive solution to 2^(n-1) = (1/n) * Sum_{d|n} a(d) * a(n/d).at n=18A299119
• Numbers k >= 2 such that A362333(k)-A371148(k)/A371149(k) sets a new maximum.at n=6A371151
• Expansion of e.g.f. (1+x)*cosh(x)^2.at n=19A383608
• Expansion of e.g.f. cosh(x)^2*(x+x^2/2).at n=19A385601
• Expansion of e.g.f. cosh(x)^2*(1 + x + x^2/2).at n=19A386227