A032743 Super-2 Numbers (2 * n^2 contains substring '22' in its decimal expansion).

19, 31, 69, 81, 105, 106, 107, 119, 127, 131, 169, 181, 190, 219, 231, 247, 269, 281, 310, 318, 319, 331, 332, 333, 334, 335, 336, 337, 338, 339, 348, 369, 381, 419, 431, 454, 469, 481, 511, 519, 531, 558, 569, 581, 601, 619, 631, 669, 679, 681, 690, 715

Offset

1,1

References

C. A. Pickover, "Keys to Infinity", New York: Wiley, p. 7, 1995.

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Eric Weisstein's World of Mathematics, Super-d Number.

Mathematica

Select[Range[1000], MemberQ[Partition[IntegerDigits[2#^2], 2, 1], {2, 2}]&] (* Harvey P. Dale, May 09 2012 *)
Select[Range[750], SequenceCount[IntegerDigits[2#^2], {2, 2}]>0&] (* Harvey P. Dale, May 13 2022 *)

Crossrefs

Cf. A014569.

Sequence in context: A033212 A104227 A274507 * A106861 A107168 A243450

Adjacent sequences: A032740 A032741 A032742 * A032744 A032745 A032746

Keyword

nonn,base

Author

Patrick De Geest, May 15 1998

Status

approved