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Numbers that are the sum of a nonzero pentagonal number and a nonzero square in at exactly two ways.
1

%I #3 Mar 30 2012 18:40:44

%S 21,26,37,60,76,93,101,122,126,133,149,151,166,191,192,201,214,247,

%T 257,266,276,288,296,311,331,336,346,359,366,368,373,379,394,406,416,

%U 431,434,435,441,451,453,474,476,478,489,492,499,526,533,534

%N Numbers that are the sum of a nonzero pentagonal number and a nonzero square in at exactly two ways.

%K nonn

%O 1,1

%A _Jonathan Vos Post_, Jan 21 2008