A058850 Palindromes that are the sum of consecutive initial odd composites.

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.

Links

Table of n, a(n) for n=1..23.

P. De Geest, Palindromic Sums

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

Cf. A058848, A058849.

Sequence in context: A157599 A063876 A063156 * A151632 A035024 A179433

Adjacent sequences: A058847 A058848 A058849 * A058851 A058852 A058853

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