24272

Appears in sequences

• Start with 1, apply 1->12, 21->21, 22->21, 2->2 (for final 2); a(n) = length of n-th term.at n=31A013950
• Even numbers k such that if a person is born in year k and lives not more than 100 years, then he never celebrates his prime birthday on a prime year.at n=26A124658
• Number of 0..28 integer arrays v[1..n] of length n with all autocorrelation values sum(i){v[i]*v[i-k]} distinct for k in 0..n-1.at n=2A171334
• Number of 0..n-1 integer arrays v[1..3] of length 3 with all autocorrelation values sum(i){v[i]*v[i-k]} distinct for k in 0..2.at n=28A171354
• Number of partitions of n, where the difference between the number of odd parts and the number of even parts is 3.at n=51A240012
• Partial sums of A169707.at n=39A253098
• Number of sets of exactly n positive integers <= n+5 having a square element sum.at n=42A281968
• Numbers k such that 2^m == 2 (mod m*(m+1)), where m = A019320(k).at n=33A297414
• Numbers k such that A019320(k) is in A217465.at n=25A297415
• Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4 or 7 king-move adjacent elements, with upper left element zero.at n=6A298495
• Number of nX7 0..1 arrays with every element equal to 0, 1, 3, 4 or 7 king-move adjacent elements, with upper left element zero.at n=6A298500
• a(n) is the largest integer that can be written with n digits in base 3/2.at n=21A304025
• The largest positive even integer that can be represented with n digits in base 3/2.at n=21A305497
• Numbers k such that k and k+1 are both hoax numbers (A019506).at n=38A329935
• Factorial base Niven numbers (A118363) with a record gap to the next factorial base Niven number.at n=17A347495
• Primitive abundant numbers for which there is no smaller primitive abundant number having the same ordered prime signature.at n=19A357921
• Expansion of Sum_{1<=i<=j} q^(i+j)/( (1-q^i)*(1-q^j) )^2.at n=40A374929