23009

Appears in sequences

• Number of sequences s of length n with s[1]=1, s[2]=1, s[j-1]<s[j]<=s[j-2]+s[j-1] for j>=3.at n=8A005270
• a(n) = Sum_{d|n} phi(d^3).at n=32A068963
• prime(n)*( prime(n)-n ).at n=39A161522
• a(n) = (sum_{k=0}^{n-1} (2k+1)*C(n-1,k)^2*C(n+k,k)^2)/n^2, where C(n,k) denotes the binomial coefficient n!/(k!(n-k)!).at n=4A246460
• a(n) is the sum of the Wieferich and Wall-Sun-Sun residues of prime(n).at n=39A339639
• Lexicographically earliest sequence of distinct nonnegative terms wherein every digit of a(n) is the absolute difference of two adjacent digits in a(n+1).at n=36A362335
• Number of distinct residues of x^n (mod n^4), x=0..n^4-1.at n=32A365101