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A219251
Numbers such that the absolute difference of a pair of adjacent decimal digits is not prime.
4
10, 11, 12, 15, 17, 19, 21, 22, 23, 26, 28, 32, 33, 34, 37, 39, 40, 43, 44, 45, 48, 51, 54, 55, 56, 59, 60, 62, 65, 66, 67, 71, 73, 76, 77, 78, 80, 82, 84, 87, 88, 89, 90, 91, 93, 95, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129
OFFSET
1,1
COMMENTS
Complement of A219248; numbers which do not occur in A219249 and A219250; analog of what is A219110 to A182177, A182178.
PROG
(PARI) is_A219251(n)={for(i=2, #n=digits(n), isprime(abs(n[i-1]-n[i]))||return(1))}
CROSSREFS
Sequence in context: A108697 A109279 A258744 * A154770 A320601 A305130
KEYWORD
nonn,base,easy
AUTHOR
M. F. Hasler, Apr 11 2013
STATUS
approved