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A058850
Palindromes that are the sum of consecutive initial odd composites.
3
9, 404, 1441, 7227, 20802, 73337, 2576752, 7576757, 144666441, 7584554857, 96520502569, 3584243424853, 3776886886773, 6651010101566, 9260919190629, 36028948184982063, 4095836722276385904, 8806146443446416088, 66832347055074323866, 331143864040468341133, 719190811555118091917, 906041488626884140609, 10450905369496350905401
OFFSET
1,1
COMMENTS
9 + 15 + 21 + 25 + 27 + 33 + ... + z = n. For values of z see A058849.
MATHEMATICA
Module[{nn=35000001, c}, c=Complement[Range[9, nn, 2], Prime[Range[ PrimePi[ nn]]]]; Select[ Accumulate[c], IntegerDigits[#] == Reverse[ IntegerDigits[ #]]&]] (* This program generates the first 15 terms of the sequence. To generate more, increase the value of nn. *) (* Harvey P. Dale, Sep 02 2012 *)
CROSSREFS
Sequence in context: A157599 A063876 A063156 * A151632 A035024 A179433
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Dec 15 2000
EXTENSIONS
a(19)-a(20) from Donovan Johnson, Sep 01 2012
a(21)-a(23) from Chai Wah Wu, Dec 06 2019
STATUS
approved