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A048411 Squares whose consecutive digits differ by 1. 3
0, 1, 4, 9, 121, 676, 12321, 1234321, 123454321, 12345654321, 1234567654321, 123456787654321, 12345678987654321 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(14), if it exists, is > 10^34. - Lars Blomberg, Nov 25 2016

Is it true that all terms are palindromes? - Chai Wah Wu, Apr 06 2018

LINKS

Table of n, a(n) for n=1..13.

MATHEMATICA

Select[Range[0, 10^7]^2, Or[# == 0, IntegerLength@ # == 1, Union@ Abs@ Differences@ IntegerDigits@ # == {1}] &] (* Michael De Vlieger, Nov 25 2016 *)

PROG

(Haskell)

a048411 n = a048411_list !! (n-1)

a048411_list = filter ((== 1) . a010052) a033075_list

-- Reinhard Zumkeller, Feb 21 2012

CROSSREFS

Cf. A002477, A048412.

Cf. A010052; intersection of A033075 and A000290.

Sequence in context: A028817 A319483 A057136 * A225739 A065379 A063783

Adjacent sequences:  A048408 A048409 A048410 * A048412 A048413 A048414

KEYWORD

nonn,base,more

AUTHOR

Patrick De Geest, Apr 15 1999

STATUS

approved

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Last modified November 19 03:37 EST 2019. Contains 329310 sequences. (Running on oeis4.)