20336

Appears in sequences

• Hexagonal pyramidal numbers, or greengrocer's numbers.at n=31A002412
• Even hexagonal pyramidal numbers.at n=14A015226
• Numbers k such that phi(prime(k) + 1) == 0 (mod k).at n=16A067732
• Sum of terms of n-th row of A077321.at n=15A077324
• Admirable numbers n such that the subtracted divisor is > sqrt(n).at n=31A109321
• Numbers d*p where d is a perfect number and p<d a prime not dividing d.at n=18A165772
• 41 times triangular numbers.at n=31A195038
• Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.at n=5A227163
• T(n,k)=Number of nXk 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(k+1) binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.at n=39A227165
• T(n,k)=Number of nXk 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(k+1) binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.at n=41A227165
• Numbers k such that card({x|sigma(x)=k}) > 1 and (Sum_{sigma(x)=k} x) < k.at n=24A258931
• Number of compositions of 2n into parts with distinct multiplicities and with exactly n parts.at n=10A321772
• Number of compositions of n into parts with distinct multiplicities and with exactly ten parts.at n=10A321780
• Number of ways to write n as an ordered sum of 8 primes (counting 1 as a prime).at n=15A341987
• Index of 2^n-1 in A353709.at n=8A352690
• Records in A353717.at n=22A353722
• Number of integer partitions of n such that (length) * (maximum) < 2n.at n=49A361852
• Number of circuits in the linear matroid M[A] where A is the n X 2^n-1 matrix whose columns are the nonzero vectors in GF(2)^n.at n=3A372350
• Integers k such that there are i groups of order k+i up to isomorphism, for i=1,2,3.at n=13A373649