A195902 Palindromic centered 22-gonal numbers.

1, 189949981, 3031430341303, 1139781083801879311, 1414082803082804141, 1444271276721724441, 1966548318138456691, 3457863858583687543, 3516331046401336153, 193361787181787163391, 3876643622232322263466783

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