55552

Appears in sequences

• Numbers having four 5's in base 10.at n=22A043512
• a(n) contains n digits (either '2' or '5') and is divisible by 2^n.at n=4A053317
• Lexicographically earliest sequence of increasing numbers whose digits satisfy the "Fractal Jump" rule using only the digits 2 and 5: keep the first digit "d" of the sequence, then jump over the next "d" digits and keep the digit "e" on which you have landed. Jump now over the next "e" digits and keep the digit "f" on which you have landed, etc. The succession "def..." of kept digits is the sequence itself.at n=24A105647
• a(n) is the least positive integer in base 10 containing n fives that is divisible by n.at n=3A112900
• Matrix square of triangle U = A136228, read by rows.at n=23A136233
• Janet periodic table of the elements and structured hexagonal diamond numbers. a(n) = A166911(2*n) + A166911(2*n+1).at n=13A167471
• Sums of 2 successive primes s = prime(m) + prime(m+1) such that all digits of s are primes.at n=36A173719
• Table of coefficients of a polynomial sequence related to the Springer numbers.at n=41A185417
• Numbers that can be expressed as the product of largest odd proper divisor and the sum of odd proper divisors.at n=6A225880
• Count of the first 10^n primes which do not contain the digit 2.at n=5A228414
• Numbers of the form (24*x + 1)*2^(y+6) with positive integers x and y.at n=33A231203
• For k in {2,3,...,9} define a sequence as follows: a(0)=0; for n>=0, a(n+1)=a(n)+1, unless a(n) ends in k, in which case a(n+1) is obtained by replacing the last digit of a(n) with the digit(s) of k^2. This is k(7).at n=38A237344
• Number of partitions of n with difference 6 between the number of odd parts and the number of even parts, both counted without multiplicity.at n=46A242697
• Integers k such that numerator and denominator of sigma(k)/k are both prime.at n=15A247086
• Numbers that are the product of exactly 10 primes and are of the form prime(n) + prime(n + 1).at n=23A281927
• Primitive terms in A066192: number k such that k is a term of A066192 and k/2 is not.at n=20A383428
• Numbers k such that sigma(k) + phi(k) = psi(k) + k.at n=6A391967