19942

Appears in sequences

• Numbers that are the sum of 7 nonzero 8th powers.at n=22A003385
• Composite numbers k such that phi(k + d(k)) = phi(k) + d(k), where phi() = A000010(), d() = A000005().at n=21A063702
• Triangle read by rows in which the n-th row gives the smallest set of n consecutive numbers with the same prime signatures.at n=8A083785
• Sequence S with property (making all terms distinct) that (i) a(1)=3, (ii) for n in S, a(n)=a(1)+a(2)+...+a(n-1), (iii) for n not in S, a(n)=the smallest number different from a(1), ..., a(n-1) not breaking condition (ii).at n=21A121174
• a(n) = 2*n + 7^n + 5^n.at n=5A121200
• Central element of a series of 5 successive nonsquarefree numbers.at n=9A188296
• a(n) is the least k such that, if x_0, x_1, x_2, ... are the iterations of the arithmetic derivative A003415 starting with x_0 = k, x_0 > x_1 > ... > x_n.at n=15A363373
• Nonsquarefree numbers k such that A003415(k) divides A276086(k), where A003415 is the arithmetic derivative, and A276086 is the primorial base exp-function.at n=33A371085
• a(0) = 1; a(n) = Sum_{k=1..n} (2^k-1) * a(k-1) * a(n-k).at n=5A376111
• Expansion of g/(1 - x*g)^3, where g = 1+x*g^4 is the g.f. of A002293.at n=6A391274