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A195902 Palindromic centered 22-gonal numbers. 1
1, 189949981, 3031430341303, 1139781083801879311, 1414082803082804141, 1444271276721724441, 1966548318138456691, 3457863858583687543, 3516331046401336153, 193361787181787163391, 3876643622232322263466783 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(12) > 10^26. - Donovan Johnson, Sep 27 2011

LINKS

Table of n, a(n) for n=1..11.

Terry Trotter, Polygonal numbers  [Warning: As of March 2018 this site appears to have been hacked. Proceed with great caution. The original content should be retrieved from the Wayback machine and added here. - N. J. A. Sloane, Mar 29 2018]

FORMULA

a(n) = A069173(A196494(n)).

CROSSREFS

Sequence in context: A084304 A228377 A178565 * A181321 A267770 A209597

Adjacent sequences:  A195899 A195900 A195901 * A195903 A195904 A195905

KEYWORD

nonn,base

AUTHOR

Kausthub Gudipati, Sep 25 2011

EXTENSIONS

a(8)-a(10) from Giovanni Resta, Sep 26 2011

a(11) from Donovan Johnson, Sep 27 2011

STATUS

approved

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Last modified May 28 09:09 EDT 2022. Contains 354112 sequences. (Running on oeis4.)