30887

Appears in sequences

• Number of partitions of n with equal number of parts congruent to each of 2 and 3 (mod 4).at n=51A035545
• Numbers k such that sum of proper divisors or aliquot parts of k^2 (excluding 1) is a square, or A048050(k^2) is a square.at n=3A063900
• 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=19A065556
• Numbers k such that 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*(k+5)*p(k+6)-1 and 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*(k+5)*p(k+6)+1 are twin primes with p(h) = h-th prime.at n=18A129313
• The number of partitions of n in which at least one part is a multiple of 4.at n=41A295342
• Number of integer partitions of n with some part that can be written as a nonnegative linear combination of the other distinct parts.at n=39A365068