51101

Appears in sequences

• Numbers x such that sigma(x)-x divides x-1, other than prime powers.at n=14A059047
• Numbers n such that sigma (phi ( n ) ) = sigma (sigma (n ) ) where phi is Euler's totient and sigma is the multiplicative sum-of-divisors function.at n=24A065556
• Binomial transform of [1, 100, 100, 100, ...].at n=9A139701
• Composite numbers which contain their sum of aliquot parts as a substring.at n=19A225417
• Composite numbers whose sum of aliquot parts divides the sum of aliquot parts of the numbers less than or equal to n and relatively prime to n.at n=11A249108
• Number of compositions of n such that no part equals any of its two immediate predecessors.at n=24A261962
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 637", based on the 5-celled von Neumann neighborhood.at n=34A273306