44144

Appears in sequences

• Numbers having four 4's in base 10.at n=9A043508
• Palindromes with exactly 6 prime factors (counted with multiplicity).at n=21A046332
• Numbers n which in decimal have the form imj, where m is the middle digit, with property that j is the reversal of i, and i = m*j.at n=12A082945
• Terms of A083393 such that the sum of the factorials of the digits is prime.at n=18A083394
• Self-describing integers with the rule: if the digit d, part of the integer i, is odd then there are d odd digits in this integer; if the digit d is even there are d even digits.at n=19A105776
• Any digit d in the sequence says: "I am part of an integer in which you'll find d digits d".at n=23A108571
• Palindromic admirable numbers.at n=15A109759
• Palindromic primes in base 5 (written in base 5).at n=24A117700
• Biquadrateful (i.e., not biquadrate-free) palindromes.at n=27A133514
• Numbers d*p where d is a perfect number and p<d a prime not dividing d.at n=31A165772
• Numbers n such that n and n+1 both have 20 divisors.at n=7A274361
• a(n) = 4*(10^(2*n+1)-1)/9 - 3*10^n.at n=2A332141
• Numbers k such that both k and k+1 are not exponentially squarefree numbers.at n=33A342188
• Concatenations x||1||x for numbers x.at n=43A392225