196248

Appears in sequences

• Chebyshev polynomials S(n,443).at n=2A098254
• (1+e)-sigma amicable numbers.at n=34A274116
• a(n) = n^4 + 4*n^2 + 3.at n=21A304726
• a(n) = 144*n^2 - 24*n (n>=1).at n=36A305072
• Lesser of semi-unitary amicable numbers pair: numbers (m, n) such that susigma(m) = susigma(n) = m + n, where susigma(n) is the sum of the semi-unitary divisors of n (A322485).at n=19A322541
• Lesser of modified exponential amicable pairs.at n=16A323758
• Lesser of exponentially-odd amicable numbers pair: numbers m < k such that m = s(k) and k = s(m), where s(k) is the sum of proper exponential-odd divisors of k.at n=8A325847
• Lesser of recursive amicable numbers pair: numbers m < k such that m = s(k) and k = s(m), where s(k) = A333926(k) - k is the sum of proper recursive divisors of k.at n=17A333929
• Number of ordered subsequences of {1,...,n} containing at least three elements and such that the first differences contain only odd numbers.at n=23A344004
• Numbers such that the two adjacent integers are a prime and the square of another prime.at n=30A347194
• Expansion of Product_{k>=1} (1 + x^k)^prime(k+1).at n=15A353169
• a(0)=1; a(n) = sum of all previous terms, eliminating repeated digits (starting from the left).at n=40A370748