23205

Appears in sequences

• Denominators of cosecant numbers: -2*(2^(2*n-1)-1)*Bernoulli(2*n).at n=24A001897
• Odd primitive abundant numbers.at n=32A006038
• Number of elementary edge-subgraphs in Moebius ladder M_n.at n=6A020879
• a(n) = [ 2nd elementary symmetric function of {sqrt(k)} ], k = 1,2,...,n.at n=45A025193
• Smaller of a pair of consecutive lucky numbers with a gap of 2n.at n=31A031884
• Numbers whose base-4 representation contains exactly four 1's and four 2's.at n=14A045109
• Odd numbers with exactly 5 distinct prime factors.at n=3A046391
• Start with n, apply k->2k+1 until reach new record prime; sequence gives number of steps needed.at n=15A051918
• Odd primitive numbers such that n! divided by product of factorials of all proper divisors of n is not an integer.at n=30A075460
• List of codewords in binary lexicode with Hamming distance 8 written as decimal numbers.at n=11A075940
• Product of the largest prime divisors of composite numbers between successive primes.at n=14A076977
• Sylvester dividends for Jacobsthal numbers.at n=23A105604
• Odd squarefree abundant numbers.at n=3A112643
• Lucky numbers (A000959) at which records in first differences (A031883) occur.at n=8A118126
• Numbers k such that 2*k+1, 4*k+1, 8*k+1 and 16*k+1 are primes.at n=22A124412
• Odd infinitary abundant numbers.at n=10A127666
• Odd unitary abundant numbers.at n=3A129485
• Smallest order of the cyclotomic polynomial whose maximal coefficient in absolute value is n.at n=20A136418
• a(n) = Product_{p-1 divides n} p, where p is an odd prime.at n=48A141459
• a(n) = (9*n^4+10*n^3-3*n^2-4*n)/12.at n=13A172045