18710

Appears in sequences

• a(0)=1; a(1)=1; a(n)= a(n-1) + floor( sqrt(a(n-1)*a(n-2))+ sqrt(a(n-3)*a(n-4))+ ... ).at n=16A043327
• Square table, read by antidiagonals, where row e.g.f.s, R(n,x), satisfy: d/dx log( R(n,x) )/n = R(n+1,x) with R(n,0) = 1; that is, the logarithmic derivative of the e.g.f. of row n, divided by n, equals the e.g.f. of row n+1, for n>=1.at n=26A145080
• Row 2 of square table A145080.at n=5A145082
• a(n) = number of 7-digit primes with digit sum n, where n runs through the non-multiples of 3 in the range [2..62].at n=13A178876
• Least k > 0 such that 1 + n^2 and 1 + (n+k)^2 have the same smallest prime factor.at n=55A217448
• Starts of runs of 3 consecutive Zeckendorf-Niven numbers (A328208).at n=20A328210
• Number of integer partitions of n whose Heinz number (product of primes of parts) is divisible by all parts.at n=45A330952
• Number of integer partitions of n whose conjugate has the same median.at n=45A363220
• Number of integer partitions of n whose parts have choosable sets of integer partitions.at n=47A387328