20355

Appears in sequences

• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MTN = ZSM-39 [Si136O272].qR starting with a T2 atom.at n=13A019184
• a(n) = Sum{a(k): k=0,1,2,...,n-4,n-2,n-1}; a(n-3) is not a summand; initial terms are 0,3,4.at n=16A049863
• Cumulative boustrophedon transform of 1, 1, 1, 1, ...at n=6A059430
• Triangle formed when the cumulative boustrophedon transform is applied to 1, 1, 1, 1, ..., read by rows from left to right.at n=21A059433
• Triangle formed when cumulative boustrophedon transform is applied to 1, 1, 1, 1, ..., read by rows in natural order.at n=27A059434
• Number of inequivalent ways (mod D_4) three checkers can be placed on an n X n board.at n=9A082966
• Integers that are Rhonda numbers to base 16.at n=6A100975
• Numbers k such that 7^k + 5^k - 1 is prime.at n=15A101234
• Triangle T(n,k) read by rows given by [2,1,2,1,2,1,2,1,2,1,2,1,...] DELTA [1,0,0,0,0,0,0,0,...] where DELTA is the operator defined in A084938 .at n=39A133367
• Expansion of e.g.f. exp(-Sum_{k>=1} prime(k)*x^k/k!).at n=9A300661
• First occurrence of n in A334144.at n=43A333959
• Numbers with five neighboring primes on the hexagonal spiral board of odd numbers.at n=22A345654