18898

Appears in sequences

• Representation degeneracies for boson strings.at n=34A005292
• Convolution of Lucas numbers and A023533.at n=19A023623
• Number of binary rooted trees with n nodes and height at most 7.at n=18A036590
• Numbers n for which there are exactly nine k such that n = k + reverse(k).at n=38A072433
• Integer part of square root of the reciprocal of a number multiplied by 10 to the power of the integer part of the square root of the number.at n=27A089245
• Indices of terms in the sequence 3, 1, 4, 5, 9, 14, 23, ... (A000285 prefixed with 3) which are prime numbers.at n=42A091158
• Smallest zeroless number x such that x^n has exactly n zero digits.at n=20A233821
• Least number k not divisible by 10 such that k^n contains n zeros.at n=21A241495
• Positive even numbers which are neither of the form p + 2^m + 1 nor of the form p + 2^m - 1 with p prime.at n=29A270446
• Numbers k such that usigma(uphi(k)) = uphi(usigma(k)), where usigma is the sum of unitary divisors function (A034448) and uphi is the unitary totient function (A047994).at n=42A329730
• a(n) is the least number k not ending in 0 such that k^n has at least n 0's in its decimal expansion.at n=21A368397