30481

Appears in sequences

• Heptagonal (or 7-gonal) pyramidal numbers: a(n) = n*(n+1)*(5*n-2)/6.at n=33A002413
• Number of partitions of n with equal nonzero number of parts congruent to each of 0 and 2 (mod 5).at n=52A035563
• Structured disdyakis dodecahedral numbers (vertex structure 9).at n=16A100161
• Numbers k such that 2^k modulo Fibonacci(k) is prime, i.e., A057862(k) is prime.at n=22A128161
• Odd heptagonal pyramidal numbers.at n=8A218324
• Number of integer partitions of n whose product is divisible by the sum of primes of their parts.at n=52A330954
• Products of three distinct strong primes.at n=29A363782
• Number of hyperplanes defined by the nonzero differences of two permutations of order n.at n=6A381243
• Expansion of (1/x) * Series_Reversion( x * (1 / (1 + x) - x^5) ).at n=14A389445