112840

Appears in sequences

• 4-dimensional pyramidal numbers: a(n) = (3*n+1)*binomial(n+2, 3)/4. Also Stirling2(n+2, n).at n=30A001296
• Numbers whose number of divisors equals the sum of their separate prime-power decompositions.at n=32A087004
• a(n) = 144*n^2 - 2*n.at n=27A158135
• Even numbers k such that 6k+1, 12k+1, 18k+1, 36k+1 and 72k+1 are all primes.at n=24A206349
• 27-gonal pyramidal numbers: a(n) = n*(n+1)*(25*n-22)/6.at n=30A256647
• Numbers m such that 6m+1, 12m+1, 18m+1, 36m+1 and 72m+1 are all prime.at n=39A257035