A058418 -id:A058418 - cp's OEIS frontend

A058417 Numbers k such that k^2 contains only digits {0,1,6}, not ending with zero.

1, 4, 10301, 10496, 10801, 81619, 1003001, 1008001, 100030001, 100080001, 326498249, 10000300001, 10000800001, 24698199551, 40012700004, 1000003000001, 1000008000001, 4000127000004, 4075127000004, 8124407769251, 78103531364504, 100000030000001, 100000080000001

Offset: 1

Patrick De Geest, Nov 15 2000

Zhao Hui Du, Table of n, a(n) for n = 1..47
Patrick De Geest, Index to related sequences
Hisanori Mishima, Sporadic tridigital solutions

Cf. A058418.

Terms a(21) and above from Zhao Hui Du, Mar 07 2024

A119041 Triangular numbers composed of digits {0,1,6}.

Original entry on oeis.org

1, 6, 10, 66, 666, 10011, 16110, 66066, 600060, 6601161, 10006101, 11066160, 660061611, 1001661661, 1061660160, 1100016060, 1660061010, 1001000010660, 1066006600011, 10010000160006, 106001000601616, 60660116660011611, 1660616006066010601060060

Offset: 1

Giovanni Resta, May 10 2006

Giovanni Resta, Tridigital Triangular Numbers

Cf. A000217, A058418, A119042. See A119033 for a table of cross-references.

Rest[Select[FromDigits/@Tuples[{0,1,6},17],OddQ[Sqrt[8#+1]]&]] (* Harvey P. Dale, Jan 14 2017 *)

a(n) = A000217(A119042(n)). - Tyler Busby, Mar 27 2023

a(23) from Tyler Busby, Mar 27 2023

cp's OEIS Frontend

A058417 Numbers k such that k^2 contains only digits {0,1,6}, not ending with zero.

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