23123

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 16.at n=19A031694
• Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,3,1.at n=4A037645
• a(1) = 1; a(2) = 2; a(3) = 3; a(n) is concatenation of a(n-3), a(n-2) and a(n-1).at n=4A065841
• Concatenation of n and a list of the divisors of n.at n=22A137464
• a(n) = 361*n^2 + 19.at n=8A158592
• a(n) is the smallest number not already in the sequence, such that the concatenation of all a(n) displays the periodic digit string 1, 2, 3 (and repeat).at n=14A165301
• a(n) = 20*n^2 + 3.at n=33A167573
• Number of composites removed in each step of the Sieve of Eratosthenes for 10^7.at n=16A227155
• Number of partitions of n where the difference between consecutive parts is at most 7.at n=39A238867
• Concatenate the terms of A027750 (omitting spaces and commas), chop into blocks of length 5, then omit any leading zeros.at n=18A362446
• Number of edge covers of the fan graph F_{n,4}.at n=2A374450
• Concatenations x||1||x for numbers x.at n=22A392225