31339

Appears in sequences

• Replace n with concatenation of its divisors >1.at n=38A037277
• Replace n with concatenation of its odd divisors >1.at n=38A037284
• Replace 2n+1 with concatenation of its divisors >1.at n=19A037287
• T(n,3), array T as in A054134.at n=10A054137
• Sum of the digits of the n-th Mersenne prime (A000668).at n=25A066538
• Number of steps that touch the x-axis in all Motzkin paths of length n.at n=10A128098
• Numbers k such that k and k^2 use only the digits 1, 2, 3, 8 and 9.at n=15A136984
• Sum of digits of n-th even superperfect number A061652(n).at n=25A138827
• Numbers n such that n^10+10 is prime.at n=45A239347
• Numbers that are the sum of four third powers in seven or more ways.at n=20A345150
• Numbers that are the sum of four third powers in eight or more ways.at n=3A345152
• Numbers that are the sum of four third powers in exactly eight ways.at n=2A345153
• Records in A388038.at n=13A388262