26677

Appears in sequences

• Strong pseudoprimes to base 46.at n=25A020272
• Composite numbers m such that phi(m)*sigma(m) is divisible by m-1.at n=32A065149
• a(n) = n*(n^2 + 2*n - 1)/2.at n=36A127736
• Wiener index of the prism graph Y_n on 2n nodes.at n=36A138179
• Wiener index of the Moebius ladder M(n).at n=36A180857
• Least positive integer m > 1 such that 1 - m^k + m^(2k) - m^(3k) + m^(4k) is prime, where k = A003592(n).at n=47A181980
• Centered 36-gonal numbers.at n=38A195316
• Right edge of the triangle A045975.at n=36A204557
• Number of 3 X n binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.at n=12A266429
• Indices of centered 10-gonal numbers (A062786) that are also triangular numbers (A000217).at n=3A280112
• Number of minimum edge covers in the n-dipyramidal graph.at n=36A298822
• Numbers m such that A338038(m) = A338038(A004086(m)) where A004086(i) is i read backwards and A338038(i) is the sum of the primes and exponents in the prime factorization of i ignoring 1-exponents; palindromes and multiples of 10 are excluded.at n=40A338039
• a(n) = hypergeom([1/2 - n/2, -n/2], [-n], -72).at n=7A350469
• a(n) = binomial(n+3, 4) + binomial(n+1, 3) + 1.at n=26A368881