124421

Appears in sequences

• Odd palindromes which are semiprimes with an even number of digits.at n=24A132288
• Number of times prime(n) occurs as the least prime factor among numbers 1 .. prime(n)^4: a(n) = A078898(A030514(n)).at n=25A250478
• Coefficient of x^2 in minimal polynomial of the continued fraction [1^n,4,1,1,1,...], where 1^n means n ones.at n=11A265802
• Composite palindromes whose divisors > 1 are all nontrivial palindromes (i.e., palindromes with at least two digits).at n=26A329100