p-adic square roots in PARI: A051276 , A051277
p-adic valuations: A001511 , A007949 , A051064 , A055457
packing squares: A005842
Packings:: A001224 , A005842 , A003012 , A004021
Padovan sequence: A000931 *
Pair-coverings:: A006185 , A006186 , A006187
pairs of relatively prime numbers: A018805 *, A100449
palindromes, A002113 *, A061917
palindromes, "pi" for: A136687 , A137180
palindromes, characteristic function of: A136522
palindromes, in base 2: A006995 *, A062014 , A062019
palindromes, in bases 10 and n: (1): A007632 , A007633 , A029961 , A029962 , A029963 , A029964 , A029804 , A029965 , A029966 , A029967 , A029968 , A029969 ,
palindromes, in bases 10 and n: (2): A029970 , A029731 , A097855 , A099165
palindromes, in bases 2 through 10: A006995 , A014190 , A014192 , A029952 , A029953 , A029954 , A029803 , A029955 , A002113
palindromes, intrinsic: A060873 -A060879 , A060947 -A060949
palindromes, multiples of n which give: A062279 , A061674 , A062293 , A061797 , A050782 , A050810
palindromes, populations of: A050250 , A050251 , A050684 , A050685
palindromes, see also (1): A007500 , A002778 , A007633 , A007573 , A002780 , A006995 , A007632 , A003098 , A007616 , A003166 , A002779 , A002069
palindromes, see also (2): A002781 , A006960
palindromic primes: see primes, palindromic
palindromic squares: A029984 for base 3, A029986 for base 4, A029988 for base 5, A029990 for base 6, A029992 for base 7, A029805 for base 8, A029994 for base 9, A002778 for base 10, A029996 for base 11, A029733 for base 16, A118651 for base 17.
palindromic squares: see also A016106 , A028818 , A059744 , A059745
palindromic, not: see non-palindromic numbers
panarithmic numbers: A005153 *
pancake numbers: A000124 *
paper-folding sequences: see folding a piece of paper