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A115745
Pentagonal numbers (A000326) that are the product of 2 palindromes greater than 1.
2
12, 22, 35, 176, 330, 2380, 2625, 2882, 3432, 3876, 4845, 8855, 9801, 12650, 14652, 15251, 21901, 26070, 52360, 61105, 66045, 84847, 111657, 137562, 156332, 197472, 230300, 254410, 260625, 270725, 287547, 295482, 351142, 359905
OFFSET
1,1
EXAMPLE
66045 is the 210th pentagonal number and 66045=111*595.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Jan 31 2006
STATUS
approved