A027727 -id:A027727 - cp's OEIS frontend

A027725 Palindromes of form k^2 + k + 8.

8, 878, 41014, 81518, 8558558, 8617168, 415242514, 874414478, 88279997288, 8035521255308, 8053537353508, 8942435342498, 8984014104898, 82375268486257328, 8563985811185893658, 41023644811311844632014, 87279499176567199497278, 462070049490878094940070264, 467190356216898612653091764

Offset: 1

Patrick De Geest

Palindromes h such that 4*h - 31 is a square. - Bruno Berselli, Aug 29 2018

P. De Geest, Palindromic Quasi_Over_Squares of the form n^2+(n+X)

Cf. A027724, A027693, A027723, A027727.

palQ[n_] := Block[{d = IntegerDigits[n]}, d == Reverse[d]]; f[n_] := n^2 + n + 8; Select[f@ Range[0, 3*10^5], palQ] (* Giovanni Resta, Aug 29 2018 *)

a(14)-a(19) from Giovanni Resta, Aug 29 2018

A027726 Numbers k such that k^2+k+9 is a palindrome.

Original entry on oeis.org

0, 1, 9, 11, 13, 22, 30, 31, 138, 300, 304, 305, 331, 438, 969, 1141, 1413, 2367, 3000, 3144, 3881, 9854, 30000, 30605, 72062, 106801, 114141, 125206, 128348, 300000, 315165, 963304, 980560, 989154, 2378507, 3000000, 3040604, 3045679, 3152290, 3932806

Offset: 1

Patrick De Geest

Giovanni Resta, Table of n, a(n) for n = 1..71
P. De Geest, Palindromic Quasi_Over_Squares of the form n^2+(n+X)

Cf. A027727, A027694, A027757, A027758, A027724.

palQ[n_] := Block[{d = IntegerDigits[n]}, d == Reverse[d]]; f[n_] := n^2 + n + 9; Select[Range[0, 3*10^5], palQ@ f@ # &]

More terms from Giovanni Resta, Aug 29 2018

cp's OEIS Frontend

A027725 Palindromes of form k^2 + k + 8.

Views

Author

Keywords

Comments

Links

Crossrefs

Programs

Mathematica

Extensions