A250433 Numbers whose squares remain squares when prepended with 7 and appended with 25 in base 10.

260355890, 507772957604920, 138060730605508232231178662796610, 41659593852939906475539587793151784, 849684968293046546038644821334016760090110

Offset

1,1

Links

Table of n, a(n) for n=1..5.

Example

260355890^2 = 67785189457692100, 76778518945769210025 = 8762335245^2.

Crossrefs

Cf. A249621, A249968, A249969, A249970, A249971, A249972, A250434, A250435.

Sequence in context: A205934 A231202 A226448 * A329464 A332314 A125576

Adjacent sequences: A250430 A250431 A250432 * A250434 A250435 A250436

Keyword

nonn,base,more

Author

Chai Wah Wu, Nov 23 2014

Extensions

a(5) from Chai Wah Wu, Jul 20 2017

Status

approved