A291334 Numbers with two or more digits such that every two consecutive digits are a square.

16, 25, 36, 49, 64, 81, 164, 364, 649, 816, 1649, 3649, 8164, 81649

Offset

1,1

Comments

The largest number in this sequence (81649) is the only prime in the sequence.

Links

Table of n, a(n) for n=1..14.

Example

164 is in this sequence because 16 and 64 are both squares.

Prog

(PARI) is(n)=if(n<16, return(0)); while(n>9, if(!issquare(n%100), return(0)); n\=10); 1 \\ Charles R Greathouse IV, Aug 23 2017

Crossrefs

Sequence in context: A235717 A368049 A319388 * A175689 A030666 A030676

Adjacent sequences: A291331 A291332 A291333 * A291335 A291336 A291337

Keyword

base,fini,full,nonn,easy

Author

Bobby Jacobs, Aug 22 2017

Status

approved