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Paolo P. Lava

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Least number such that the concatenation of all the previous terms with it is squarefree and has n prime factors
Least number such that the concatenation of all the previous terms with it is squarefree and has n prime factors
 
 
Numbers k such that k divides sigma(k-2) + sigma(k-1) + sigma(k+1) + sigma(k+2)
Numbers k such that k divides sigma(k-2) + sigma(k-1) + sigma(k+1) + sigma(k+2)
 
 
Quasi-narcissistic numbers: k-digit numbers n whose sum of k-th powers of their digits is equal to n +- 1
Quasi-narcissistic numbers: k-digit numbers n whose sum of k-th powers of their digits is equal to n +- 1
 
 
Smallest composite number with n distinct prime factors with property that the concatenation of its distinct prime factors, in descending order, is a palindrome
Smallest composite number with n distinct prime factors with property that the concatenation of its distinct prime factors, in descending order, is a palindrome
 
 
Squarefree difference of semiprimes
Squarefree difference of semiprimes
 
 
a(n) is the maximum prime factor of the concatenation of a(n-2) and a(n-1), with a(1)=1 and a(2)=2
a(n) is the maximum prime factor of the concatenation of a(n-2) and a(n-1), with a(1)=1 and a(2)=2
 
 
a(n) is the maximum prime factor of the concatenation of all the previous terms, with a(1)=1, a(2)=2
a(n) is the maximum prime factor of the concatenation of all the previous terms, with a(1)=1, a(2)=2