28912

Appears in sequences

• Pentagonal numbers with prime indices.at n=33A116995
• Pentagonal numbers for which the sum of the digits is also a pentagonal number.at n=17A117709
• G.f. satisfies: A(x) = Product_{n>=1} (1+x^n)*(1 + x^n*A(x))/((1-x^n)*(1 - x^n*A(x))).at n=6A192624
• Number of (n+1) X (1+1) 0..2 arrays with the maximum plus the minimum of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=5A237227
• Number of (n+1) X (6+1) 0..2 arrays with the maximum plus the minimum of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=0A237232
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=15A237234
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=20A237234
• E.g.f.: exp( Sum_{n>=1} Fibonacci(n)*x^n/n ).at n=7A244430
• Aliquot sequence starting at 702.at n=8A269542
• Pentagonal numbers divisible by 4.at n=35A298397
• Pentagonal numbers that are abundant.at n=46A379264